drivers/net/ethernet/intel/igb/igb_ptp.c

   1 /*
   2  * PTP Hardware Clock (PHC) driver for the Intel 82576 and 82580
   3  *
   4  * Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20 #include <linux/module.h>
  21 #include <linux/device.h>
  22 #include <linux/pci.h>
  23
  24 #include "igb.h"
  25
  26 #define INCVALUE_MASK           0x7fffffff
  27 #define ISGN                    0x80000000
  28
  29 /*
  30  * The 82580 timesync updates the system timer every 8ns by 8ns,
  31  * and this update value cannot be reprogrammed.
  32  *
  33  * Neither the 82576 nor the 82580 offer registers wide enough to hold
  34  * nanoseconds time values for very long. For the 82580, SYSTIM always
  35  * counts nanoseconds, but the upper 24 bits are not availible. The
  36  * frequency is adjusted by changing the 32 bit fractional nanoseconds
  37  * register, TIMINCA.
  38  *
  39  * For the 82576, the SYSTIM register time unit is affect by the
  40  * choice of the 24 bit TININCA:IV (incvalue) field. Five bits of this
  41  * field are needed to provide the nominal 16 nanosecond period,
  42  * leaving 19 bits for fractional nanoseconds.
  43  *
  44  * We scale the NIC clock cycle by a large factor so that relatively
  45  * small clock corrections can be added or subtracted at each clock
  46  * tick. The drawbacks of a large factor are a) that the clock
  47  * register overflows more quickly (not such a big deal) and b) that
  48  * the increment per tick has to fit into 24 bits.  As a result we
  49  * need to use a shift of 19 so we can fit a value of 16 into the
  50  * TIMINCA register.
  51  *
  52  *
  53  *             SYSTIMH            SYSTIML
  54  *        +--------------+   +---+---+------+
  55  *  82576 |      32      |   | 8 | 5 |  19  |
  56  *        +--------------+   +---+---+------+
  57  *         \________ 45 bits _______/  fract
  58  *
  59  *        +----------+---+   +--------------+
  60  *  82580 |    24    | 8 |   |      32      |
  61  *        +----------+---+   +--------------+
  62  *          reserved  \______ 40 bits _____/
  63  *
  64  *
  65  * The 45 bit 82576 SYSTIM overflows every
  66  *   2^45 * 10^-9 / 3600 = 9.77 hours.
  67  *
  68  * The 40 bit 82580 SYSTIM overflows every
  69  *   2^40 * 10^-9 /  60  = 18.3 minutes.
  70  */
  71
  72 #define IGB_SYSTIM_OVERFLOW_PERIOD      (HZ * 60 * 9)
  73 #define INCPERIOD_82576                 (1 << E1000_TIMINCA_16NS_SHIFT)
  74 #define INCVALUE_82576_MASK             ((1 << E1000_TIMINCA_16NS_SHIFT) - 1)
  75 #define INCVALUE_82576                  (16 << IGB_82576_TSYNC_SHIFT)
  76 #define IGB_NBITS_82580                 40
  77
  78 /*
  79  * SYSTIM read access for the 82576
  80  */
  81
  82 static cycle_t igb_ptp_read_82576(const struct cyclecounter *cc)
  83 {
  84         struct igb_adapter *igb = container_of(cc, struct igb_adapter, cc);
  85         struct e1000_hw *hw = &igb->hw;
  86         u64 val;
  87         u32 lo, hi;
  88
  89         lo = rd32(E1000_SYSTIML);
  90         hi = rd32(E1000_SYSTIMH);
  91
  92         val = ((u64) hi) << 32;
  93         val |= lo;
  94
  95         return val;
  96 }
  97
  98 /*
  99  * SYSTIM read access for the 82580
 100  */
 101
 102 static cycle_t igb_ptp_read_82580(const struct cyclecounter *cc)
 103 {
 104         struct igb_adapter *igb = container_of(cc, struct igb_adapter, cc);
 105         struct e1000_hw *hw = &igb->hw;
 106         u64 val;
 107         u32 lo, hi, jk;
 108
 109         /*
 110          * The timestamp latches on lowest register read. For the 82580
 111          * the lowest register is SYSTIMR instead of SYSTIML.  However we only
 112          * need to provide nanosecond resolution, so we just ignore it.
 113          */
 114         jk = rd32(E1000_SYSTIMR);
 115         lo = rd32(E1000_SYSTIML);
 116         hi = rd32(E1000_SYSTIMH);
 117
 118         val = ((u64) hi) << 32;
 119         val |= lo;
 120
 121         return val;
 122 }
 123
 124 /*
 125  * SYSTIM read access for I210/I211
 126  */
 127
 128 static void igb_ptp_read_i210(struct igb_adapter *adapter, struct timespec *ts)
 129 {
 130         struct e1000_hw *hw = &adapter->hw;
 131         u32 sec, nsec, jk;
 132
 133         /*
 134          * The timestamp latches on lowest register read. For I210/I211, the
 135          * lowest register is SYSTIMR. Since we only need to provide nanosecond
 136          * resolution, we can ignore it.
 137          */
 138         jk = rd32(E1000_SYSTIMR);
 139         nsec = rd32(E1000_SYSTIML);
 140         sec = rd32(E1000_SYSTIMH);
 141
 142         ts->tv_sec = sec;
 143         ts->tv_nsec = nsec;
 144 }
 145
 146 static void igb_ptp_write_i210(struct igb_adapter *adapter,
 147                                const struct timespec *ts)
 148 {
 149         struct e1000_hw *hw = &adapter->hw;
 150
 151         /*
 152          * Writing the SYSTIMR register is not necessary as it only provides
 153          * sub-nanosecond resolution.
 154          */
 155         wr32(E1000_SYSTIML, ts->tv_nsec);
 156         wr32(E1000_SYSTIMH, ts->tv_sec);
 157 }
 158
 159 /**
 160  * igb_ptp_systim_to_hwtstamp - convert system time value to hw timestamp
 161  * @adapter: board private structure
 162  * @hwtstamps: timestamp structure to update
 163  * @systim: unsigned 64bit system time value.
 164  *
 165  * We need to convert the system time value stored in the RX/TXSTMP registers
 166  * into a hwtstamp which can be used by the upper level timestamping functions.
 167  *
 168  * The 'tmreg_lock' spinlock is used to protect the consistency of the
 169  * system time value. This is needed because reading the 64 bit time
 170  * value involves reading two (or three) 32 bit registers. The first
 171  * read latches the value. Ditto for writing.
 172  *
 173  * In addition, here have extended the system time with an overflow
 174  * counter in software.
 175  **/
 176 static void igb_ptp_systim_to_hwtstamp(struct igb_adapter *adapter,
 177                                        struct skb_shared_hwtstamps *hwtstamps,
 178                                        u64 systim)
 179 {
 180         unsigned long flags;
 181         u64 ns;
 182
 183         switch (adapter->hw.mac.type) {
 184         case e1000_82576:
 185         case e1000_82580:
 186         case e1000_i350:
 187                 spin_lock_irqsave(&adapter->tmreg_lock, flags);
 188
 189                 ns = timecounter_cyc2time(&adapter->tc, systim);
 190
 191                 spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
 192
 193                 memset(hwtstamps, 0, sizeof(*hwtstamps));
 194                 hwtstamps->hwtstamp = ns_to_ktime(ns);
 195                 break;
 196         case e1000_i210:
 197         case e1000_i211:
 198                 memset(hwtstamps, 0, sizeof(*hwtstamps));
 199                 /* Upper 32 bits contain s, lower 32 bits contain ns. */
 200                 hwtstamps->hwtstamp = ktime_set(systim >> 32,
 201                                                 systim & 0xFFFFFFFF);
 202                 break;
 203         default:
 204                 break;
 205         }
 206 }
 207
 208 /*
 209  * PTP clock operations
 210  */
 211
 212 static int igb_ptp_adjfreq_82576(struct ptp_clock_info *ptp, s32 ppb)
 213 {
 214         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 215                                                ptp_caps);
 216         struct e1000_hw *hw = &igb->hw;
 217         int neg_adj = 0;
 218         u64 rate;
 219         u32 incvalue;
 220
 221         if (ppb < 0) {
 222                 neg_adj = 1;
 223                 ppb = -ppb;
 224         }
 225         rate = ppb;
 226         rate <<= 14;
 227         rate = div_u64(rate, 1953125);
 228
 229         incvalue = 16 << IGB_82576_TSYNC_SHIFT;
 230
 231         if (neg_adj)
 232                 incvalue -= rate;
 233         else
 234                 incvalue += rate;
 235
 236         wr32(E1000_TIMINCA, INCPERIOD_82576 | (incvalue & INCVALUE_82576_MASK));
 237
 238         return 0;
 239 }
 240
 241 static int igb_ptp_adjfreq_82580(struct ptp_clock_info *ptp, s32 ppb)
 242 {
 243         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 244                                                ptp_caps);
 245         struct e1000_hw *hw = &igb->hw;
 246         int neg_adj = 0;
 247         u64 rate;
 248         u32 inca;
 249
 250         if (ppb < 0) {
 251                 neg_adj = 1;
 252                 ppb = -ppb;
 253         }
 254         rate = ppb;
 255         rate <<= 26;
 256         rate = div_u64(rate, 1953125);
 257
 258         inca = rate & INCVALUE_MASK;
 259         if (neg_adj)
 260                 inca |= ISGN;
 261
 262         wr32(E1000_TIMINCA, inca);
 263
 264         return 0;
 265 }
 266
 267 static int igb_ptp_adjtime_82576(struct ptp_clock_info *ptp, s64 delta)
 268 {
 269         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 270                                                ptp_caps);
 271         unsigned long flags;
 272         s64 now;
 273
 274         spin_lock_irqsave(&igb->tmreg_lock, flags);
 275
 276         now = timecounter_read(&igb->tc);
 277         now += delta;
 278         timecounter_init(&igb->tc, &igb->cc, now);
 279
 280         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 281
 282         return 0;
 283 }
 284
 285 static int igb_ptp_adjtime_i210(struct ptp_clock_info *ptp, s64 delta)
 286 {
 287         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 288                                                ptp_caps);
 289         unsigned long flags;
 290         struct timespec now, then = ns_to_timespec(delta);
 291
 292         spin_lock_irqsave(&igb->tmreg_lock, flags);
 293
 294         igb_ptp_read_i210(igb, &now);
 295         now = timespec_add(now, then);
 296         igb_ptp_write_i210(igb, (const struct timespec *)&now);
 297
 298         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 299
 300         return 0;
 301 }
 302
 303 static int igb_ptp_gettime_82576(struct ptp_clock_info *ptp,
 304                                  struct timespec *ts)
 305 {
 306         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 307                                                ptp_caps);
 308         unsigned long flags;
 309         u64 ns;
 310         u32 remainder;
 311
 312         spin_lock_irqsave(&igb->tmreg_lock, flags);
 313
 314         ns = timecounter_read(&igb->tc);
 315
 316         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 317
 318         ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder);
 319         ts->tv_nsec = remainder;
 320
 321         return 0;
 322 }
 323
 324 static int igb_ptp_gettime_i210(struct ptp_clock_info *ptp,
 325                                 struct timespec *ts)
 326 {
 327         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 328                                                ptp_caps);
 329         unsigned long flags;
 330
 331         spin_lock_irqsave(&igb->tmreg_lock, flags);
 332
 333         igb_ptp_read_i210(igb, ts);
 334
 335         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 336
 337         return 0;
 338 }
 339
 340 static int igb_ptp_settime_82576(struct ptp_clock_info *ptp,
 341                                  const struct timespec *ts)
 342 {
 343         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 344                                                ptp_caps);
 345         unsigned long flags;
 346         u64 ns;
 347
 348         ns = ts->tv_sec * 1000000000ULL;
 349         ns += ts->tv_nsec;
 350
 351         spin_lock_irqsave(&igb->tmreg_lock, flags);
 352
 353         timecounter_init(&igb->tc, &igb->cc, ns);
 354
 355         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 356
 357         return 0;
 358 }
 359
 360 static int igb_ptp_settime_i210(struct ptp_clock_info *ptp,
 361                                 const struct timespec *ts)
 362 {
 363         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 364                                                ptp_caps);
 365         unsigned long flags;
 366
 367         spin_lock_irqsave(&igb->tmreg_lock, flags);
 368
 369         igb_ptp_write_i210(igb, ts);
 370
 371         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 372
 373         return 0;
 374 }
 375
 376 static int igb_ptp_enable(struct ptp_clock_info *ptp,
 377                           struct ptp_clock_request *rq, int on)
 378 {
 379         return -EOPNOTSUPP;
 380 }
 381
 382 /**
 383  * igb_ptp_tx_work
 384  * @work: pointer to work struct
 385  *
 386  * This work function polls the TSYNCTXCTL valid bit to determine when a
 387  * timestamp has been taken for the current stored skb.
 388  */
 389 void igb_ptp_tx_work(struct work_struct *work)
 390 {
 391         struct igb_adapter *adapter = container_of(work, struct igb_adapter,
 392                                                    ptp_tx_work);
 393         struct e1000_hw *hw = &adapter->hw;
 394         u32 tsynctxctl;
 395
 396         if (!adapter->ptp_tx_skb)
 397                 return;
 398
 399         tsynctxctl = rd32(E1000_TSYNCTXCTL);
 400         if (tsynctxctl & E1000_TSYNCTXCTL_VALID)
 401                 igb_ptp_tx_hwtstamp(adapter);
 402         else
 403                 /* reschedule to check later */
 404                 schedule_work(&adapter->ptp_tx_work);
 405 }
 406
 407 static void igb_ptp_overflow_check(struct work_struct *work)
 408 {
 409         struct igb_adapter *igb =
 410                 container_of(work, struct igb_adapter, ptp_overflow_work.work);
 411         struct timespec ts;
 412
 413         igb->ptp_caps.gettime(&igb->ptp_caps, &ts);
 414
 415         pr_debug("igb overflow check at %ld.%09lu\n", ts.tv_sec, ts.tv_nsec);
 416
 417         schedule_delayed_work(&igb->ptp_overflow_work,
 418                               IGB_SYSTIM_OVERFLOW_PERIOD);
 419 }
 420
 421 /**
 422  * igb_ptp_tx_hwtstamp - utility function which checks for TX time stamp
 423  * @adapter: Board private structure.
 424  *
 425  * If we were asked to do hardware stamping and such a time stamp is
 426  * available, then it must have been for this skb here because we only
 427  * allow only one such packet into the queue.
 428  */
 429 void igb_ptp_tx_hwtstamp(struct igb_adapter *adapter)
 430 {
 431         struct e1000_hw *hw = &adapter->hw;
 432         struct skb_shared_hwtstamps shhwtstamps;
 433         u64 regval;
 434
 435         regval = rd32(E1000_TXSTMPL);
 436         regval |= (u64)rd32(E1000_TXSTMPH) << 32;
 437
 438         igb_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval);
 439         skb_tstamp_tx(adapter->ptp_tx_skb, &shhwtstamps);
 440         dev_kfree_skb_any(adapter->ptp_tx_skb);
 441         adapter->ptp_tx_skb = NULL;
 442 }
 443
 444 void igb_ptp_rx_hwtstamp(struct igb_q_vector *q_vector,
 445                          union e1000_adv_rx_desc *rx_desc,
 446                          struct sk_buff *skb)
 447 {
 448         struct igb_adapter *adapter = q_vector->adapter;
 449         struct e1000_hw *hw = &adapter->hw;
 450         u64 regval;
 451
 452         if (!igb_test_staterr(rx_desc, E1000_RXDADV_STAT_TSIP |
 453                                        E1000_RXDADV_STAT_TS))
 454                 return;
 455
 456         /*
 457          * If this bit is set, then the RX registers contain the time stamp. No
 458          * other packet will be time stamped until we read these registers, so
 459          * read the registers to make them available again. Because only one
 460          * packet can be time stamped at a time, we know that the register
 461          * values must belong to this one here and therefore we don't need to
 462          * compare any of the additional attributes stored for it.
 463          *
 464          * If nothing went wrong, then it should have a shared tx_flags that we
 465          * can turn into a skb_shared_hwtstamps.
 466          */
 467         if (igb_test_staterr(rx_desc, E1000_RXDADV_STAT_TSIP)) {
 468                 u32 *stamp = (u32 *)skb->data;
 469                 regval = le32_to_cpu(*(stamp + 2));
 470                 regval |= (u64)le32_to_cpu(*(stamp + 3)) << 32;
 471                 skb_pull(skb, IGB_TS_HDR_LEN);
 472         } else {
 473                 if (!(rd32(E1000_TSYNCRXCTL) & E1000_TSYNCRXCTL_VALID))
 474                         return;
 475
 476                 regval = rd32(E1000_RXSTMPL);
 477                 regval |= (u64)rd32(E1000_RXSTMPH) << 32;
 478         }
 479
 480         igb_ptp_systim_to_hwtstamp(adapter, skb_hwtstamps(skb), regval);
 481 }
 482
 483 /**
 484  * igb_ptp_hwtstamp_ioctl - control hardware time stamping
 485  * @netdev:
 486  * @ifreq:
 487  * @cmd:
 488  *
 489  * Outgoing time stamping can be enabled and disabled. Play nice and
 490  * disable it when requested, although it shouldn't case any overhead
 491  * when no packet needs it. At most one packet in the queue may be
 492  * marked for time stamping, otherwise it would be impossible to tell
 493  * for sure to which packet the hardware time stamp belongs.
 494  *
 495  * Incoming time stamping has to be configured via the hardware
 496  * filters. Not all combinations are supported, in particular event
 497  * type has to be specified. Matching the kind of event packet is
 498  * not supported, with the exception of "all V2 events regardless of
 499  * level 2 or 4".
 500  *
 501  **/
 502 int igb_ptp_hwtstamp_ioctl(struct net_device *netdev,
 503                            struct ifreq *ifr, int cmd)
 504 {
 505         struct igb_adapter *adapter = netdev_priv(netdev);
 506         struct e1000_hw *hw = &adapter->hw;
 507         struct hwtstamp_config config;
 508         u32 tsync_tx_ctl = E1000_TSYNCTXCTL_ENABLED;
 509         u32 tsync_rx_ctl = E1000_TSYNCRXCTL_ENABLED;
 510         u32 tsync_rx_cfg = 0;
 511         bool is_l4 = false;
 512         bool is_l2 = false;
 513         u32 regval;
 514
 515         if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
 516                 return -EFAULT;
 517
 518         /* reserved for future extensions */
 519         if (config.flags)
 520                 return -EINVAL;
 521
 522         switch (config.tx_type) {
 523         case HWTSTAMP_TX_OFF:
 524                 tsync_tx_ctl = 0;
 525         case HWTSTAMP_TX_ON:
 526                 break;
 527         default:
 528                 return -ERANGE;
 529         }
 530
 531         switch (config.rx_filter) {
 532         case HWTSTAMP_FILTER_NONE:
 533                 tsync_rx_ctl = 0;
 534                 break;
 535         case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
 536         case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
 537         case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
 538         case HWTSTAMP_FILTER_ALL:
 539                 /*
 540                  * register TSYNCRXCFG must be set, therefore it is not
 541                  * possible to time stamp both Sync and Delay_Req messages
 542                  * => fall back to time stamping all packets
 543                  */
 544                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_ALL;
 545                 config.rx_filter = HWTSTAMP_FILTER_ALL;
 546                 break;
 547         case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
 548                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L4_V1;
 549                 tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V1_SYNC_MESSAGE;
 550                 is_l4 = true;
 551                 break;
 552         case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
 553                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L4_V1;
 554                 tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V1_DELAY_REQ_MESSAGE;
 555                 is_l4 = true;
 556                 break;
 557         case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
 558         case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
 559                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L2_L4_V2;
 560                 tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V2_SYNC_MESSAGE;
 561                 is_l2 = true;
 562                 is_l4 = true;
 563                 config.rx_filter = HWTSTAMP_FILTER_SOME;
 564                 break;
 565         case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
 566         case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
 567                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L2_L4_V2;
 568                 tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V2_DELAY_REQ_MESSAGE;
 569                 is_l2 = true;
 570                 is_l4 = true;
 571                 config.rx_filter = HWTSTAMP_FILTER_SOME;
 572                 break;
 573         case HWTSTAMP_FILTER_PTP_V2_EVENT:
 574         case HWTSTAMP_FILTER_PTP_V2_SYNC:
 575         case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
 576                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_EVENT_V2;
 577                 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
 578                 is_l2 = true;
 579                 is_l4 = true;
 580                 break;
 581         default:
 582                 return -ERANGE;
 583         }
 584
 585         if (hw->mac.type == e1000_82575) {
 586                 if (tsync_rx_ctl | tsync_tx_ctl)
 587                         return -EINVAL;
 588                 return 0;
 589         }
 590
 591         /*
 592          * Per-packet timestamping only works if all packets are
 593          * timestamped, so enable timestamping in all packets as
 594          * long as one rx filter was configured.
 595          */
 596         if ((hw->mac.type >= e1000_82580) && tsync_rx_ctl) {
 597                 tsync_rx_ctl = E1000_TSYNCRXCTL_ENABLED;
 598                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_ALL;
 599
 600                 if ((hw->mac.type == e1000_i210) ||
 601                     (hw->mac.type == e1000_i211)) {
 602                         regval = rd32(E1000_RXPBS);
 603                         regval |= E1000_RXPBS_CFG_TS_EN;
 604                         wr32(E1000_RXPBS, regval);
 605                 }
 606         }
 607
 608         /* enable/disable TX */
 609         regval = rd32(E1000_TSYNCTXCTL);
 610         regval &= ~E1000_TSYNCTXCTL_ENABLED;
 611         regval |= tsync_tx_ctl;
 612         wr32(E1000_TSYNCTXCTL, regval);
 613
 614         /* enable/disable RX */
 615         regval = rd32(E1000_TSYNCRXCTL);
 616         regval &= ~(E1000_TSYNCRXCTL_ENABLED | E1000_TSYNCRXCTL_TYPE_MASK);
 617         regval |= tsync_rx_ctl;
 618         wr32(E1000_TSYNCRXCTL, regval);
 619
 620         /* define which PTP packets are time stamped */
 621         wr32(E1000_TSYNCRXCFG, tsync_rx_cfg);
 622
 623         /* define ethertype filter for timestamped packets */
 624         if (is_l2)
 625                 wr32(E1000_ETQF(3),
 626                      (E1000_ETQF_FILTER_ENABLE | /* enable filter */
 627                       E1000_ETQF_1588 | /* enable timestamping */
 628                       ETH_P_1588));     /* 1588 eth protocol type */
 629         else
 630                 wr32(E1000_ETQF(3), 0);
 631
 632 #define PTP_PORT 319
 633         /* L4 Queue Filter[3]: filter by destination port and protocol */
 634         if (is_l4) {
 635                 u32 ftqf = (IPPROTO_UDP /* UDP */
 636                         | E1000_FTQF_VF_BP /* VF not compared */
 637                         | E1000_FTQF_1588_TIME_STAMP /* Enable Timestamping */
 638                         | E1000_FTQF_MASK); /* mask all inputs */
 639                 ftqf &= ~E1000_FTQF_MASK_PROTO_BP; /* enable protocol check */
 640
 641                 wr32(E1000_IMIR(3), htons(PTP_PORT));
 642                 wr32(E1000_IMIREXT(3),
 643                      (E1000_IMIREXT_SIZE_BP | E1000_IMIREXT_CTRL_BP));
 644                 if (hw->mac.type == e1000_82576) {
 645                         /* enable source port check */
 646                         wr32(E1000_SPQF(3), htons(PTP_PORT));
 647                         ftqf &= ~E1000_FTQF_MASK_SOURCE_PORT_BP;
 648                 }
 649                 wr32(E1000_FTQF(3), ftqf);
 650         } else {
 651                 wr32(E1000_FTQF(3), E1000_FTQF_MASK);
 652         }
 653         wrfl();
 654
 655         /* clear TX/RX time stamp registers, just to be sure */
 656         regval = rd32(E1000_TXSTMPL);
 657         regval = rd32(E1000_TXSTMPH);
 658         regval = rd32(E1000_RXSTMPL);
 659         regval = rd32(E1000_RXSTMPH);
 660
 661         return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
 662                 -EFAULT : 0;
 663 }
 664
 665 void igb_ptp_init(struct igb_adapter *adapter)
 666 {
 667         struct e1000_hw *hw = &adapter->hw;
 668         struct net_device *netdev = adapter->netdev;
 669
 670         switch (hw->mac.type) {
 671         case e1000_82576:
 672                 snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
 673                 adapter->ptp_caps.owner = THIS_MODULE;
 674                 adapter->ptp_caps.max_adj = 1000000000;
 675                 adapter->ptp_caps.n_ext_ts = 0;
 676                 adapter->ptp_caps.pps = 0;
 677                 adapter->ptp_caps.adjfreq = igb_ptp_adjfreq_82576;
 678                 adapter->ptp_caps.adjtime = igb_ptp_adjtime_82576;
 679                 adapter->ptp_caps.gettime = igb_ptp_gettime_82576;
 680                 adapter->ptp_caps.settime = igb_ptp_settime_82576;
 681                 adapter->ptp_caps.enable = igb_ptp_enable;
 682                 adapter->cc.read = igb_ptp_read_82576;
 683                 adapter->cc.mask = CLOCKSOURCE_MASK(64);
 684                 adapter->cc.mult = 1;
 685                 adapter->cc.shift = IGB_82576_TSYNC_SHIFT;
 686                 /* Dial the nominal frequency. */
 687                 wr32(E1000_TIMINCA, INCPERIOD_82576 | INCVALUE_82576);
 688                 break;
 689         case e1000_82580:
 690         case e1000_i350:
 691                 snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
 692                 adapter->ptp_caps.owner = THIS_MODULE;
 693                 adapter->ptp_caps.max_adj = 62499999;
 694                 adapter->ptp_caps.n_ext_ts = 0;
 695                 adapter->ptp_caps.pps = 0;
 696                 adapter->ptp_caps.adjfreq = igb_ptp_adjfreq_82580;
 697                 adapter->ptp_caps.adjtime = igb_ptp_adjtime_82576;
 698                 adapter->ptp_caps.gettime = igb_ptp_gettime_82576;
 699                 adapter->ptp_caps.settime = igb_ptp_settime_82576;
 700                 adapter->ptp_caps.enable = igb_ptp_enable;
 701                 adapter->cc.read = igb_ptp_read_82580;
 702                 adapter->cc.mask = CLOCKSOURCE_MASK(IGB_NBITS_82580);
 703                 adapter->cc.mult = 1;
 704                 adapter->cc.shift = 0;
 705                 /* Enable the timer functions by clearing bit 31. */
 706                 wr32(E1000_TSAUXC, 0x0);
 707                 break;
 708         case e1000_i210:
 709         case e1000_i211:
 710                 snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
 711                 adapter->ptp_caps.owner = THIS_MODULE;
 712                 adapter->ptp_caps.max_adj = 62499999;
 713                 adapter->ptp_caps.n_ext_ts = 0;
 714                 adapter->ptp_caps.pps = 0;
 715                 adapter->ptp_caps.adjfreq = igb_ptp_adjfreq_82580;
 716                 adapter->ptp_caps.adjtime = igb_ptp_adjtime_i210;
 717                 adapter->ptp_caps.gettime = igb_ptp_gettime_i210;
 718                 adapter->ptp_caps.settime = igb_ptp_settime_i210;
 719                 adapter->ptp_caps.enable = igb_ptp_enable;
 720                 /* Enable the timer functions by clearing bit 31. */
 721                 wr32(E1000_TSAUXC, 0x0);
 722                 break;
 723         default:
 724                 adapter->ptp_clock = NULL;
 725                 return;
 726         }
 727
 728         wrfl();
 729
 730         spin_lock_init(&adapter->tmreg_lock);
 731         INIT_WORK(&adapter->ptp_tx_work, igb_ptp_tx_work);
 732
 733         /* Initialize the clock and overflow work for devices that need it. */
 734         if ((hw->mac.type == e1000_i210) || (hw->mac.type == e1000_i211)) {
 735                 struct timespec ts = ktime_to_timespec(ktime_get_real());
 736
 737                 igb_ptp_settime_i210(&adapter->ptp_caps, &ts);
 738         } else {
 739                 timecounter_init(&adapter->tc, &adapter->cc,
 740                                  ktime_to_ns(ktime_get_real()));
 741
 742                 INIT_DELAYED_WORK(&adapter->ptp_overflow_work,
 743                                   igb_ptp_overflow_check);
 744
 745                 schedule_delayed_work(&adapter->ptp_overflow_work,
 746                                       IGB_SYSTIM_OVERFLOW_PERIOD);
 747         }
 748
 749         /* Initialize the time sync interrupts for devices that support it. */
 750         if (hw->mac.type >= e1000_82580) {
 751                 wr32(E1000_TSIM, E1000_TSIM_TXTS);
 752                 wr32(E1000_IMS, E1000_IMS_TS);
 753         }
 754
 755         adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps,
 756                                                 &adapter->pdev->dev);
 757         if (IS_ERR(adapter->ptp_clock)) {
 758                 adapter->ptp_clock = NULL;
 759                 dev_err(&adapter->pdev->dev, "ptp_clock_register failed\n");
 760         } else {
 761                 dev_info(&adapter->pdev->dev, "added PHC on %s\n",
 762                          adapter->netdev->name);
 763                 adapter->flags |= IGB_FLAG_PTP;
 764         }
 765 }
 766
 767 /**
 768  * igb_ptp_stop - Disable PTP device and stop the overflow check.
 769  * @adapter: Board private structure.
 770  *
 771  * This function stops the PTP support and cancels the delayed work.
 772  **/
 773 void igb_ptp_stop(struct igb_adapter *adapter)
 774 {
 775         switch (adapter->hw.mac.type) {
 776         case e1000_82576:
 777         case e1000_82580:
 778         case e1000_i350:
 779                 cancel_delayed_work_sync(&adapter->ptp_overflow_work);
 780                 break;
 781         case e1000_i210:
 782         case e1000_i211:
 783                 /* No delayed work to cancel. */
 784                 break;
 785         default:
 786                 return;
 787         }
 788
 789         cancel_work_sync(&adapter->ptp_tx_work);
 790
 791         if (adapter->ptp_clock) {
 792                 ptp_clock_unregister(adapter->ptp_clock);
 793                 dev_info(&adapter->pdev->dev, "removed PHC on %s\n",
 794                          adapter->netdev->name);
 795                 adapter->flags &= ~IGB_FLAG_PTP;
 796         }
 797 }
 798
 799 /**
 800  * igb_ptp_reset - Re-enable the adapter for PTP following a reset.
 801  * @adapter: Board private structure.
 802  *
 803  * This function handles the reset work required to re-enable the PTP device.
 804  **/
 805 void igb_ptp_reset(struct igb_adapter *adapter)
 806 {
 807         struct e1000_hw *hw = &adapter->hw;
 808
 809         if (!(adapter->flags & IGB_FLAG_PTP))
 810                 return;
 811
 812         switch (adapter->hw.mac.type) {
 813         case e1000_82576:
 814                 /* Dial the nominal frequency. */
 815                 wr32(E1000_TIMINCA, INCPERIOD_82576 | INCVALUE_82576);
 816                 break;
 817         case e1000_82580:
 818         case e1000_i350:
 819         case e1000_i210:
 820         case e1000_i211:
 821                 /* Enable the timer functions and interrupts. */
 822                 wr32(E1000_TSAUXC, 0x0);
 823                 wr32(E1000_TSIM, E1000_TSIM_TXTS);
 824                 wr32(E1000_IMS, E1000_IMS_TS);
 825                 break;
 826         default:
 827                 /* No work to do. */
 828                 return;
 829         }
 830
 831         /* Re-initialize the timer. */
 832         if ((hw->mac.type == e1000_i210) || (hw->mac.type == e1000_i211)) {
 833                 struct timespec ts = ktime_to_timespec(ktime_get_real());
 834
 835                 igb_ptp_settime_i210(&adapter->ptp_caps, &ts);
 836         } else {
 837                 timecounter_init(&adapter->tc, &adapter->cc,
 838                                  ktime_to_ns(ktime_get_real()));
 839         }
 840 }