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

   1 /* PTP Hardware Clock (PHC) driver for the Intel 82576 and 82580
   2  *
   3  * Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18 #include <linux/module.h>
  19 #include <linux/device.h>
  20 #include <linux/pci.h>
  21 #include <linux/ptp_classify.h>
  22
  23 #include "igb.h"
  24
  25 #define INCVALUE_MASK           0x7fffffff
  26 #define ISGN                    0x80000000
  27
  28 /* The 82580 timesync updates the system timer every 8ns by 8ns,
  29  * and this update value cannot be reprogrammed.
  30  *
  31  * Neither the 82576 nor the 82580 offer registers wide enough to hold
  32  * nanoseconds time values for very long. For the 82580, SYSTIM always
  33  * counts nanoseconds, but the upper 24 bits are not available. The
  34  * frequency is adjusted by changing the 32 bit fractional nanoseconds
  35  * register, TIMINCA.
  36  *
  37  * For the 82576, the SYSTIM register time unit is affect by the
  38  * choice of the 24 bit TININCA:IV (incvalue) field. Five bits of this
  39  * field are needed to provide the nominal 16 nanosecond period,
  40  * leaving 19 bits for fractional nanoseconds.
  41  *
  42  * We scale the NIC clock cycle by a large factor so that relatively
  43  * small clock corrections can be added or subtracted at each clock
  44  * tick. The drawbacks of a large factor are a) that the clock
  45  * register overflows more quickly (not such a big deal) and b) that
  46  * the increment per tick has to fit into 24 bits.  As a result we
  47  * need to use a shift of 19 so we can fit a value of 16 into the
  48  * TIMINCA register.
  49  *
  50  *
  51  *             SYSTIMH            SYSTIML
  52  *        +--------------+   +---+---+------+
  53  *  82576 |      32      |   | 8 | 5 |  19  |
  54  *        +--------------+   +---+---+------+
  55  *         \________ 45 bits _______/  fract
  56  *
  57  *        +----------+---+   +--------------+
  58  *  82580 |    24    | 8 |   |      32      |
  59  *        +----------+---+   +--------------+
  60  *          reserved  \______ 40 bits _____/
  61  *
  62  *
  63  * The 45 bit 82576 SYSTIM overflows every
  64  *   2^45 * 10^-9 / 3600 = 9.77 hours.
  65  *
  66  * The 40 bit 82580 SYSTIM overflows every
  67  *   2^40 * 10^-9 /  60  = 18.3 minutes.
  68  */
  69
  70 #define IGB_SYSTIM_OVERFLOW_PERIOD      (HZ * 60 * 9)
  71 #define IGB_PTP_TX_TIMEOUT              (HZ * 15)
  72 #define INCPERIOD_82576                 (1 << E1000_TIMINCA_16NS_SHIFT)
  73 #define INCVALUE_82576_MASK             ((1 << E1000_TIMINCA_16NS_SHIFT) - 1)
  74 #define INCVALUE_82576                  (16 << IGB_82576_TSYNC_SHIFT)
  75 #define IGB_NBITS_82580                 40
  76
  77 static void igb_ptp_tx_hwtstamp(struct igb_adapter *adapter);
  78
  79 /* SYSTIM read access for the 82576 */
  80 static cycle_t igb_ptp_read_82576(const struct cyclecounter *cc)
  81 {
  82         struct igb_adapter *igb = container_of(cc, struct igb_adapter, cc);
  83         struct e1000_hw *hw = &igb->hw;
  84         u64 val;
  85         u32 lo, hi;
  86
  87         lo = rd32(E1000_SYSTIML);
  88         hi = rd32(E1000_SYSTIMH);
  89
  90         val = ((u64) hi) << 32;
  91         val |= lo;
  92
  93         return val;
  94 }
  95
  96 /* SYSTIM read access for the 82580 */
  97 static cycle_t igb_ptp_read_82580(const struct cyclecounter *cc)
  98 {
  99         struct igb_adapter *igb = container_of(cc, struct igb_adapter, cc);
 100         struct e1000_hw *hw = &igb->hw;
 101         u32 lo, hi;
 102         u64 val;
 103
 104         /* The timestamp latches on lowest register read. For the 82580
 105          * the lowest register is SYSTIMR instead of SYSTIML.  However we only
 106          * need to provide nanosecond resolution, so we just ignore it.
 107          */
 108         rd32(E1000_SYSTIMR);
 109         lo = rd32(E1000_SYSTIML);
 110         hi = rd32(E1000_SYSTIMH);
 111
 112         val = ((u64) hi) << 32;
 113         val |= lo;
 114
 115         return val;
 116 }
 117
 118 /* SYSTIM read access for I210/I211 */
 119 static void igb_ptp_read_i210(struct igb_adapter *adapter,
 120                               struct timespec64 *ts)
 121 {
 122         struct e1000_hw *hw = &adapter->hw;
 123         u32 sec, nsec;
 124
 125         /* The timestamp latches on lowest register read. For I210/I211, the
 126          * lowest register is SYSTIMR. Since we only need to provide nanosecond
 127          * resolution, we can ignore it.
 128          */
 129         rd32(E1000_SYSTIMR);
 130         nsec = rd32(E1000_SYSTIML);
 131         sec = rd32(E1000_SYSTIMH);
 132
 133         ts->tv_sec = sec;
 134         ts->tv_nsec = nsec;
 135 }
 136
 137 static void igb_ptp_write_i210(struct igb_adapter *adapter,
 138                                const struct timespec64 *ts)
 139 {
 140         struct e1000_hw *hw = &adapter->hw;
 141
 142         /* Writing the SYSTIMR register is not necessary as it only provides
 143          * sub-nanosecond resolution.
 144          */
 145         wr32(E1000_SYSTIML, ts->tv_nsec);
 146         wr32(E1000_SYSTIMH, (u32)ts->tv_sec);
 147 }
 148
 149 /**
 150  * igb_ptp_systim_to_hwtstamp - convert system time value to hw timestamp
 151  * @adapter: board private structure
 152  * @hwtstamps: timestamp structure to update
 153  * @systim: unsigned 64bit system time value.
 154  *
 155  * We need to convert the system time value stored in the RX/TXSTMP registers
 156  * into a hwtstamp which can be used by the upper level timestamping functions.
 157  *
 158  * The 'tmreg_lock' spinlock is used to protect the consistency of the
 159  * system time value. This is needed because reading the 64 bit time
 160  * value involves reading two (or three) 32 bit registers. The first
 161  * read latches the value. Ditto for writing.
 162  *
 163  * In addition, here have extended the system time with an overflow
 164  * counter in software.
 165  **/
 166 static void igb_ptp_systim_to_hwtstamp(struct igb_adapter *adapter,
 167                                        struct skb_shared_hwtstamps *hwtstamps,
 168                                        u64 systim)
 169 {
 170         unsigned long flags;
 171         u64 ns;
 172
 173         switch (adapter->hw.mac.type) {
 174         case e1000_82576:
 175         case e1000_82580:
 176         case e1000_i354:
 177         case e1000_i350:
 178                 spin_lock_irqsave(&adapter->tmreg_lock, flags);
 179
 180                 ns = timecounter_cyc2time(&adapter->tc, systim);
 181
 182                 spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
 183
 184                 memset(hwtstamps, 0, sizeof(*hwtstamps));
 185                 hwtstamps->hwtstamp = ns_to_ktime(ns);
 186                 break;
 187         case e1000_i210:
 188         case e1000_i211:
 189                 memset(hwtstamps, 0, sizeof(*hwtstamps));
 190                 /* Upper 32 bits contain s, lower 32 bits contain ns. */
 191                 hwtstamps->hwtstamp = ktime_set(systim >> 32,
 192                                                 systim & 0xFFFFFFFF);
 193                 break;
 194         default:
 195                 break;
 196         }
 197 }
 198
 199 /* PTP clock operations */
 200 static int igb_ptp_adjfreq_82576(struct ptp_clock_info *ptp, s32 ppb)
 201 {
 202         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 203                                                ptp_caps);
 204         struct e1000_hw *hw = &igb->hw;
 205         int neg_adj = 0;
 206         u64 rate;
 207         u32 incvalue;
 208
 209         if (ppb < 0) {
 210                 neg_adj = 1;
 211                 ppb = -ppb;
 212         }
 213         rate = ppb;
 214         rate <<= 14;
 215         rate = div_u64(rate, 1953125);
 216
 217         incvalue = 16 << IGB_82576_TSYNC_SHIFT;
 218
 219         if (neg_adj)
 220                 incvalue -= rate;
 221         else
 222                 incvalue += rate;
 223
 224         wr32(E1000_TIMINCA, INCPERIOD_82576 | (incvalue & INCVALUE_82576_MASK));
 225
 226         return 0;
 227 }
 228
 229 static int igb_ptp_adjfreq_82580(struct ptp_clock_info *ptp, s32 ppb)
 230 {
 231         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 232                                                ptp_caps);
 233         struct e1000_hw *hw = &igb->hw;
 234         int neg_adj = 0;
 235         u64 rate;
 236         u32 inca;
 237
 238         if (ppb < 0) {
 239                 neg_adj = 1;
 240                 ppb = -ppb;
 241         }
 242         rate = ppb;
 243         rate <<= 26;
 244         rate = div_u64(rate, 1953125);
 245
 246         inca = rate & INCVALUE_MASK;
 247         if (neg_adj)
 248                 inca |= ISGN;
 249
 250         wr32(E1000_TIMINCA, inca);
 251
 252         return 0;
 253 }
 254
 255 static int igb_ptp_adjtime_82576(struct ptp_clock_info *ptp, s64 delta)
 256 {
 257         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 258                                                ptp_caps);
 259         unsigned long flags;
 260
 261         spin_lock_irqsave(&igb->tmreg_lock, flags);
 262         timecounter_adjtime(&igb->tc, delta);
 263         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 264
 265         return 0;
 266 }
 267
 268 static int igb_ptp_adjtime_i210(struct ptp_clock_info *ptp, s64 delta)
 269 {
 270         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 271                                                ptp_caps);
 272         unsigned long flags;
 273         struct timespec64 now, then = ns_to_timespec64(delta);
 274
 275         spin_lock_irqsave(&igb->tmreg_lock, flags);
 276
 277         igb_ptp_read_i210(igb, &now);
 278         now = timespec64_add(now, then);
 279         igb_ptp_write_i210(igb, (const struct timespec64 *)&now);
 280
 281         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 282
 283         return 0;
 284 }
 285
 286 static int igb_ptp_gettime_82576(struct ptp_clock_info *ptp,
 287                                  struct timespec64 *ts)
 288 {
 289         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 290                                                ptp_caps);
 291         unsigned long flags;
 292         u64 ns;
 293
 294         spin_lock_irqsave(&igb->tmreg_lock, flags);
 295
 296         ns = timecounter_read(&igb->tc);
 297
 298         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 299
 300         *ts = ns_to_timespec64(ns);
 301
 302         return 0;
 303 }
 304
 305 static int igb_ptp_gettime_i210(struct ptp_clock_info *ptp,
 306                                 struct timespec64 *ts)
 307 {
 308         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 309                                                ptp_caps);
 310         unsigned long flags;
 311
 312         spin_lock_irqsave(&igb->tmreg_lock, flags);
 313
 314         igb_ptp_read_i210(igb, ts);
 315
 316         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 317
 318         return 0;
 319 }
 320
 321 static int igb_ptp_settime_82576(struct ptp_clock_info *ptp,
 322                                  const struct timespec64 *ts)
 323 {
 324         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 325                                                ptp_caps);
 326         unsigned long flags;
 327         u64 ns;
 328
 329         ns = timespec64_to_ns(ts);
 330
 331         spin_lock_irqsave(&igb->tmreg_lock, flags);
 332
 333         timecounter_init(&igb->tc, &igb->cc, ns);
 334
 335         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 336
 337         return 0;
 338 }
 339
 340 static int igb_ptp_settime_i210(struct ptp_clock_info *ptp,
 341                                 const struct timespec64 *ts)
 342 {
 343         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 344                                                ptp_caps);
 345         unsigned long flags;
 346
 347         spin_lock_irqsave(&igb->tmreg_lock, flags);
 348
 349         igb_ptp_write_i210(igb, ts);
 350
 351         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 352
 353         return 0;
 354 }
 355
 356 static void igb_pin_direction(int pin, int input, u32 *ctrl, u32 *ctrl_ext)
 357 {
 358         u32 *ptr = pin < 2 ? ctrl : ctrl_ext;
 359         static const u32 mask[IGB_N_SDP] = {
 360                 E1000_CTRL_SDP0_DIR,
 361                 E1000_CTRL_SDP1_DIR,
 362                 E1000_CTRL_EXT_SDP2_DIR,
 363                 E1000_CTRL_EXT_SDP3_DIR,
 364         };
 365
 366         if (input)
 367                 *ptr &= ~mask[pin];
 368         else
 369                 *ptr |= mask[pin];
 370 }
 371
 372 static void igb_pin_extts(struct igb_adapter *igb, int chan, int pin)
 373 {
 374         static const u32 aux0_sel_sdp[IGB_N_SDP] = {
 375                 AUX0_SEL_SDP0, AUX0_SEL_SDP1, AUX0_SEL_SDP2, AUX0_SEL_SDP3,
 376         };
 377         static const u32 aux1_sel_sdp[IGB_N_SDP] = {
 378                 AUX1_SEL_SDP0, AUX1_SEL_SDP1, AUX1_SEL_SDP2, AUX1_SEL_SDP3,
 379         };
 380         static const u32 ts_sdp_en[IGB_N_SDP] = {
 381                 TS_SDP0_EN, TS_SDP1_EN, TS_SDP2_EN, TS_SDP3_EN,
 382         };
 383         struct e1000_hw *hw = &igb->hw;
 384         u32 ctrl, ctrl_ext, tssdp = 0;
 385
 386         ctrl = rd32(E1000_CTRL);
 387         ctrl_ext = rd32(E1000_CTRL_EXT);
 388         tssdp = rd32(E1000_TSSDP);
 389
 390         igb_pin_direction(pin, 1, &ctrl, &ctrl_ext);
 391
 392         /* Make sure this pin is not enabled as an output. */
 393         tssdp &= ~ts_sdp_en[pin];
 394
 395         if (chan == 1) {
 396                 tssdp &= ~AUX1_SEL_SDP3;
 397                 tssdp |= aux1_sel_sdp[pin] | AUX1_TS_SDP_EN;
 398         } else {
 399                 tssdp &= ~AUX0_SEL_SDP3;
 400                 tssdp |= aux0_sel_sdp[pin] | AUX0_TS_SDP_EN;
 401         }
 402
 403         wr32(E1000_TSSDP, tssdp);
 404         wr32(E1000_CTRL, ctrl);
 405         wr32(E1000_CTRL_EXT, ctrl_ext);
 406 }
 407
 408 static void igb_pin_perout(struct igb_adapter *igb, int chan, int pin, int freq)
 409 {
 410         static const u32 aux0_sel_sdp[IGB_N_SDP] = {
 411                 AUX0_SEL_SDP0, AUX0_SEL_SDP1, AUX0_SEL_SDP2, AUX0_SEL_SDP3,
 412         };
 413         static const u32 aux1_sel_sdp[IGB_N_SDP] = {
 414                 AUX1_SEL_SDP0, AUX1_SEL_SDP1, AUX1_SEL_SDP2, AUX1_SEL_SDP3,
 415         };
 416         static const u32 ts_sdp_en[IGB_N_SDP] = {
 417                 TS_SDP0_EN, TS_SDP1_EN, TS_SDP2_EN, TS_SDP3_EN,
 418         };
 419         static const u32 ts_sdp_sel_tt0[IGB_N_SDP] = {
 420                 TS_SDP0_SEL_TT0, TS_SDP1_SEL_TT0,
 421                 TS_SDP2_SEL_TT0, TS_SDP3_SEL_TT0,
 422         };
 423         static const u32 ts_sdp_sel_tt1[IGB_N_SDP] = {
 424                 TS_SDP0_SEL_TT1, TS_SDP1_SEL_TT1,
 425                 TS_SDP2_SEL_TT1, TS_SDP3_SEL_TT1,
 426         };
 427         static const u32 ts_sdp_sel_fc0[IGB_N_SDP] = {
 428                 TS_SDP0_SEL_FC0, TS_SDP1_SEL_FC0,
 429                 TS_SDP2_SEL_FC0, TS_SDP3_SEL_FC0,
 430         };
 431         static const u32 ts_sdp_sel_fc1[IGB_N_SDP] = {
 432                 TS_SDP0_SEL_FC1, TS_SDP1_SEL_FC1,
 433                 TS_SDP2_SEL_FC1, TS_SDP3_SEL_FC1,
 434         };
 435         static const u32 ts_sdp_sel_clr[IGB_N_SDP] = {
 436                 TS_SDP0_SEL_FC1, TS_SDP1_SEL_FC1,
 437                 TS_SDP2_SEL_FC1, TS_SDP3_SEL_FC1,
 438         };
 439         struct e1000_hw *hw = &igb->hw;
 440         u32 ctrl, ctrl_ext, tssdp = 0;
 441
 442         ctrl = rd32(E1000_CTRL);
 443         ctrl_ext = rd32(E1000_CTRL_EXT);
 444         tssdp = rd32(E1000_TSSDP);
 445
 446         igb_pin_direction(pin, 0, &ctrl, &ctrl_ext);
 447
 448         /* Make sure this pin is not enabled as an input. */
 449         if ((tssdp & AUX0_SEL_SDP3) == aux0_sel_sdp[pin])
 450                 tssdp &= ~AUX0_TS_SDP_EN;
 451
 452         if ((tssdp & AUX1_SEL_SDP3) == aux1_sel_sdp[pin])
 453                 tssdp &= ~AUX1_TS_SDP_EN;
 454
 455         tssdp &= ~ts_sdp_sel_clr[pin];
 456         if (freq) {
 457                 if (chan == 1)
 458                         tssdp |= ts_sdp_sel_fc1[pin];
 459                 else
 460                         tssdp |= ts_sdp_sel_fc0[pin];
 461         } else {
 462                 if (chan == 1)
 463                         tssdp |= ts_sdp_sel_tt1[pin];
 464                 else
 465                         tssdp |= ts_sdp_sel_tt0[pin];
 466         }
 467         tssdp |= ts_sdp_en[pin];
 468
 469         wr32(E1000_TSSDP, tssdp);
 470         wr32(E1000_CTRL, ctrl);
 471         wr32(E1000_CTRL_EXT, ctrl_ext);
 472 }
 473
 474 static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp,
 475                                        struct ptp_clock_request *rq, int on)
 476 {
 477         struct igb_adapter *igb =
 478                 container_of(ptp, struct igb_adapter, ptp_caps);
 479         struct e1000_hw *hw = &igb->hw;
 480         u32 tsauxc, tsim, tsauxc_mask, tsim_mask, trgttiml, trgttimh, freqout;
 481         unsigned long flags;
 482         struct timespec64 ts;
 483         int use_freq = 0, pin = -1;
 484         s64 ns;
 485
 486         switch (rq->type) {
 487         case PTP_CLK_REQ_EXTTS:
 488                 if (on) {
 489                         pin = ptp_find_pin(igb->ptp_clock, PTP_PF_EXTTS,
 490                                            rq->extts.index);
 491                         if (pin < 0)
 492                                 return -EBUSY;
 493                 }
 494                 if (rq->extts.index == 1) {
 495                         tsauxc_mask = TSAUXC_EN_TS1;
 496                         tsim_mask = TSINTR_AUTT1;
 497                 } else {
 498                         tsauxc_mask = TSAUXC_EN_TS0;
 499                         tsim_mask = TSINTR_AUTT0;
 500                 }
 501                 spin_lock_irqsave(&igb->tmreg_lock, flags);
 502                 tsauxc = rd32(E1000_TSAUXC);
 503                 tsim = rd32(E1000_TSIM);
 504                 if (on) {
 505                         igb_pin_extts(igb, rq->extts.index, pin);
 506                         tsauxc |= tsauxc_mask;
 507                         tsim |= tsim_mask;
 508                 } else {
 509                         tsauxc &= ~tsauxc_mask;
 510                         tsim &= ~tsim_mask;
 511                 }
 512                 wr32(E1000_TSAUXC, tsauxc);
 513                 wr32(E1000_TSIM, tsim);
 514                 spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 515                 return 0;
 516
 517         case PTP_CLK_REQ_PEROUT:
 518                 if (on) {
 519                         pin = ptp_find_pin(igb->ptp_clock, PTP_PF_PEROUT,
 520                                            rq->perout.index);
 521                         if (pin < 0)
 522                                 return -EBUSY;
 523                 }
 524                 ts.tv_sec = rq->perout.period.sec;
 525                 ts.tv_nsec = rq->perout.period.nsec;
 526                 ns = timespec64_to_ns(&ts);
 527                 ns = ns >> 1;
 528                 if (on && ns <= 70000000LL) {
 529                         if (ns < 8LL)
 530                                 return -EINVAL;
 531                         use_freq = 1;
 532                 }
 533                 ts = ns_to_timespec64(ns);
 534                 if (rq->perout.index == 1) {
 535                         if (use_freq) {
 536                                 tsauxc_mask = TSAUXC_EN_CLK1 | TSAUXC_ST1;
 537                                 tsim_mask = 0;
 538                         } else {
 539                                 tsauxc_mask = TSAUXC_EN_TT1;
 540                                 tsim_mask = TSINTR_TT1;
 541                         }
 542                         trgttiml = E1000_TRGTTIML1;
 543                         trgttimh = E1000_TRGTTIMH1;
 544                         freqout = E1000_FREQOUT1;
 545                 } else {
 546                         if (use_freq) {
 547                                 tsauxc_mask = TSAUXC_EN_CLK0 | TSAUXC_ST0;
 548                                 tsim_mask = 0;
 549                         } else {
 550                                 tsauxc_mask = TSAUXC_EN_TT0;
 551                                 tsim_mask = TSINTR_TT0;
 552                         }
 553                         trgttiml = E1000_TRGTTIML0;
 554                         trgttimh = E1000_TRGTTIMH0;
 555                         freqout = E1000_FREQOUT0;
 556                 }
 557                 spin_lock_irqsave(&igb->tmreg_lock, flags);
 558                 tsauxc = rd32(E1000_TSAUXC);
 559                 tsim = rd32(E1000_TSIM);
 560                 if (rq->perout.index == 1) {
 561                         tsauxc &= ~(TSAUXC_EN_TT1 | TSAUXC_EN_CLK1 | TSAUXC_ST1);
 562                         tsim &= ~TSINTR_TT1;
 563                 } else {
 564                         tsauxc &= ~(TSAUXC_EN_TT0 | TSAUXC_EN_CLK0 | TSAUXC_ST0);
 565                         tsim &= ~TSINTR_TT0;
 566                 }
 567                 if (on) {
 568                         int i = rq->perout.index;
 569                         igb_pin_perout(igb, i, pin, use_freq);
 570                         igb->perout[i].start.tv_sec = rq->perout.start.sec;
 571                         igb->perout[i].start.tv_nsec = rq->perout.start.nsec;
 572                         igb->perout[i].period.tv_sec = ts.tv_sec;
 573                         igb->perout[i].period.tv_nsec = ts.tv_nsec;
 574                         wr32(trgttimh, rq->perout.start.sec);
 575                         wr32(trgttiml, rq->perout.start.nsec);
 576                         if (use_freq)
 577                                 wr32(freqout, ns);
 578                         tsauxc |= tsauxc_mask;
 579                         tsim |= tsim_mask;
 580                 }
 581                 wr32(E1000_TSAUXC, tsauxc);
 582                 wr32(E1000_TSIM, tsim);
 583                 spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 584                 return 0;
 585
 586         case PTP_CLK_REQ_PPS:
 587                 spin_lock_irqsave(&igb->tmreg_lock, flags);
 588                 tsim = rd32(E1000_TSIM);
 589                 if (on)
 590                         tsim |= TSINTR_SYS_WRAP;
 591                 else
 592                         tsim &= ~TSINTR_SYS_WRAP;
 593                 wr32(E1000_TSIM, tsim);
 594                 spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 595                 return 0;
 596         }
 597
 598         return -EOPNOTSUPP;
 599 }
 600
 601 static int igb_ptp_feature_enable(struct ptp_clock_info *ptp,
 602                                   struct ptp_clock_request *rq, int on)
 603 {
 604         return -EOPNOTSUPP;
 605 }
 606
 607 static int igb_ptp_verify_pin(struct ptp_clock_info *ptp, unsigned int pin,
 608                               enum ptp_pin_function func, unsigned int chan)
 609 {
 610         switch (func) {
 611         case PTP_PF_NONE:
 612         case PTP_PF_EXTTS:
 613         case PTP_PF_PEROUT:
 614                 break;
 615         case PTP_PF_PHYSYNC:
 616                 return -1;
 617         }
 618         return 0;
 619 }
 620
 621 /**
 622  * igb_ptp_tx_work
 623  * @work: pointer to work struct
 624  *
 625  * This work function polls the TSYNCTXCTL valid bit to determine when a
 626  * timestamp has been taken for the current stored skb.
 627  **/
 628 static void igb_ptp_tx_work(struct work_struct *work)
 629 {
 630         struct igb_adapter *adapter = container_of(work, struct igb_adapter,
 631                                                    ptp_tx_work);
 632         struct e1000_hw *hw = &adapter->hw;
 633         u32 tsynctxctl;
 634
 635         if (!adapter->ptp_tx_skb)
 636                 return;
 637
 638         if (time_is_before_jiffies(adapter->ptp_tx_start +
 639                                    IGB_PTP_TX_TIMEOUT)) {
 640                 dev_kfree_skb_any(adapter->ptp_tx_skb);
 641                 adapter->ptp_tx_skb = NULL;
 642                 clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
 643                 adapter->tx_hwtstamp_timeouts++;
 644                 dev_warn(&adapter->pdev->dev, "clearing Tx timestamp hang\n");
 645                 return;
 646         }
 647
 648         tsynctxctl = rd32(E1000_TSYNCTXCTL);
 649         if (tsynctxctl & E1000_TSYNCTXCTL_VALID)
 650                 igb_ptp_tx_hwtstamp(adapter);
 651         else
 652                 /* reschedule to check later */
 653                 schedule_work(&adapter->ptp_tx_work);
 654 }
 655
 656 static void igb_ptp_overflow_check(struct work_struct *work)
 657 {
 658         struct igb_adapter *igb =
 659                 container_of(work, struct igb_adapter, ptp_overflow_work.work);
 660         struct timespec64 ts;
 661
 662         igb->ptp_caps.gettime64(&igb->ptp_caps, &ts);
 663
 664         pr_debug("igb overflow check at %lld.%09lu\n",
 665                  (long long) ts.tv_sec, ts.tv_nsec);
 666
 667         schedule_delayed_work(&igb->ptp_overflow_work,
 668                               IGB_SYSTIM_OVERFLOW_PERIOD);
 669 }
 670
 671 /**
 672  * igb_ptp_rx_hang - detect error case when Rx timestamp registers latched
 673  * @adapter: private network adapter structure
 674  *
 675  * This watchdog task is scheduled to detect error case where hardware has
 676  * dropped an Rx packet that was timestamped when the ring is full. The
 677  * particular error is rare but leaves the device in a state unable to timestamp
 678  * any future packets.
 679  **/
 680 void igb_ptp_rx_hang(struct igb_adapter *adapter)
 681 {
 682         struct e1000_hw *hw = &adapter->hw;
 683         u32 tsyncrxctl = rd32(E1000_TSYNCRXCTL);
 684         unsigned long rx_event;
 685
 686         if (hw->mac.type != e1000_82576)
 687                 return;
 688
 689         /* If we don't have a valid timestamp in the registers, just update the
 690          * timeout counter and exit
 691          */
 692         if (!(tsyncrxctl & E1000_TSYNCRXCTL_VALID)) {
 693                 adapter->last_rx_ptp_check = jiffies;
 694                 return;
 695         }
 696
 697         /* Determine the most recent watchdog or rx_timestamp event */
 698         rx_event = adapter->last_rx_ptp_check;
 699         if (time_after(adapter->last_rx_timestamp, rx_event))
 700                 rx_event = adapter->last_rx_timestamp;
 701
 702         /* Only need to read the high RXSTMP register to clear the lock */
 703         if (time_is_before_jiffies(rx_event + 5 * HZ)) {
 704                 rd32(E1000_RXSTMPH);
 705                 adapter->last_rx_ptp_check = jiffies;
 706                 adapter->rx_hwtstamp_cleared++;
 707                 dev_warn(&adapter->pdev->dev, "clearing Rx timestamp hang\n");
 708         }
 709 }
 710
 711 /**
 712  * igb_ptp_tx_hwtstamp - utility function which checks for TX time stamp
 713  * @adapter: Board private structure.
 714  *
 715  * If we were asked to do hardware stamping and such a time stamp is
 716  * available, then it must have been for this skb here because we only
 717  * allow only one such packet into the queue.
 718  **/
 719 static void igb_ptp_tx_hwtstamp(struct igb_adapter *adapter)
 720 {
 721         struct e1000_hw *hw = &adapter->hw;
 722         struct skb_shared_hwtstamps shhwtstamps;
 723         u64 regval;
 724
 725         regval = rd32(E1000_TXSTMPL);
 726         regval |= (u64)rd32(E1000_TXSTMPH) << 32;
 727
 728         igb_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval);
 729         skb_tstamp_tx(adapter->ptp_tx_skb, &shhwtstamps);
 730         dev_kfree_skb_any(adapter->ptp_tx_skb);
 731         adapter->ptp_tx_skb = NULL;
 732         clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
 733 }
 734
 735 /**
 736  * igb_ptp_rx_pktstamp - retrieve Rx per packet timestamp
 737  * @q_vector: Pointer to interrupt specific structure
 738  * @va: Pointer to address containing Rx buffer
 739  * @skb: Buffer containing timestamp and packet
 740  *
 741  * This function is meant to retrieve a timestamp from the first buffer of an
 742  * incoming frame.  The value is stored in little endian format starting on
 743  * byte 8.
 744  **/
 745 void igb_ptp_rx_pktstamp(struct igb_q_vector *q_vector,
 746                          unsigned char *va,
 747                          struct sk_buff *skb)
 748 {
 749         __le64 *regval = (__le64 *)va;
 750
 751         /* The timestamp is recorded in little endian format.
 752          * DWORD: 0        1        2        3
 753          * Field: Reserved Reserved SYSTIML  SYSTIMH
 754          */
 755         igb_ptp_systim_to_hwtstamp(q_vector->adapter, skb_hwtstamps(skb),
 756                                    le64_to_cpu(regval[1]));
 757 }
 758
 759 /**
 760  * igb_ptp_rx_rgtstamp - retrieve Rx timestamp stored in register
 761  * @q_vector: Pointer to interrupt specific structure
 762  * @skb: Buffer containing timestamp and packet
 763  *
 764  * This function is meant to retrieve a timestamp from the internal registers
 765  * of the adapter and store it in the skb.
 766  **/
 767 void igb_ptp_rx_rgtstamp(struct igb_q_vector *q_vector,
 768                          struct sk_buff *skb)
 769 {
 770         struct igb_adapter *adapter = q_vector->adapter;
 771         struct e1000_hw *hw = &adapter->hw;
 772         u64 regval;
 773
 774         /* If this bit is set, then the RX registers contain the time stamp. No
 775          * other packet will be time stamped until we read these registers, so
 776          * read the registers to make them available again. Because only one
 777          * packet can be time stamped at a time, we know that the register
 778          * values must belong to this one here and therefore we don't need to
 779          * compare any of the additional attributes stored for it.
 780          *
 781          * If nothing went wrong, then it should have a shared tx_flags that we
 782          * can turn into a skb_shared_hwtstamps.
 783          */
 784         if (!(rd32(E1000_TSYNCRXCTL) & E1000_TSYNCRXCTL_VALID))
 785                 return;
 786
 787         regval = rd32(E1000_RXSTMPL);
 788         regval |= (u64)rd32(E1000_RXSTMPH) << 32;
 789
 790         igb_ptp_systim_to_hwtstamp(adapter, skb_hwtstamps(skb), regval);
 791
 792         /* Update the last_rx_timestamp timer in order to enable watchdog check
 793          * for error case of latched timestamp on a dropped packet.
 794          */
 795         adapter->last_rx_timestamp = jiffies;
 796 }
 797
 798 /**
 799  * igb_ptp_get_ts_config - get hardware time stamping config
 800  * @netdev:
 801  * @ifreq:
 802  *
 803  * Get the hwtstamp_config settings to return to the user. Rather than attempt
 804  * to deconstruct the settings from the registers, just return a shadow copy
 805  * of the last known settings.
 806  **/
 807 int igb_ptp_get_ts_config(struct net_device *netdev, struct ifreq *ifr)
 808 {
 809         struct igb_adapter *adapter = netdev_priv(netdev);
 810         struct hwtstamp_config *config = &adapter->tstamp_config;
 811
 812         return copy_to_user(ifr->ifr_data, config, sizeof(*config)) ?
 813                 -EFAULT : 0;
 814 }
 815
 816 /**
 817  * igb_ptp_set_timestamp_mode - setup hardware for timestamping
 818  * @adapter: networking device structure
 819  * @config: hwtstamp configuration
 820  *
 821  * Outgoing time stamping can be enabled and disabled. Play nice and
 822  * disable it when requested, although it shouldn't case any overhead
 823  * when no packet needs it. At most one packet in the queue may be
 824  * marked for time stamping, otherwise it would be impossible to tell
 825  * for sure to which packet the hardware time stamp belongs.
 826  *
 827  * Incoming time stamping has to be configured via the hardware
 828  * filters. Not all combinations are supported, in particular event
 829  * type has to be specified. Matching the kind of event packet is
 830  * not supported, with the exception of "all V2 events regardless of
 831  * level 2 or 4".
 832  */
 833 static int igb_ptp_set_timestamp_mode(struct igb_adapter *adapter,
 834                                       struct hwtstamp_config *config)
 835 {
 836         struct e1000_hw *hw = &adapter->hw;
 837         u32 tsync_tx_ctl = E1000_TSYNCTXCTL_ENABLED;
 838         u32 tsync_rx_ctl = E1000_TSYNCRXCTL_ENABLED;
 839         u32 tsync_rx_cfg = 0;
 840         bool is_l4 = false;
 841         bool is_l2 = false;
 842         u32 regval;
 843
 844         /* reserved for future extensions */
 845         if (config->flags)
 846                 return -EINVAL;
 847
 848         switch (config->tx_type) {
 849         case HWTSTAMP_TX_OFF:
 850                 tsync_tx_ctl = 0;
 851         case HWTSTAMP_TX_ON:
 852                 break;
 853         default:
 854                 return -ERANGE;
 855         }
 856
 857         switch (config->rx_filter) {
 858         case HWTSTAMP_FILTER_NONE:
 859                 tsync_rx_ctl = 0;
 860                 break;
 861         case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
 862                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L4_V1;
 863                 tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V1_SYNC_MESSAGE;
 864                 is_l4 = true;
 865                 break;
 866         case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
 867                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L4_V1;
 868                 tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V1_DELAY_REQ_MESSAGE;
 869                 is_l4 = true;
 870                 break;
 871         case HWTSTAMP_FILTER_PTP_V2_EVENT:
 872         case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
 873         case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
 874         case HWTSTAMP_FILTER_PTP_V2_SYNC:
 875         case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
 876         case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
 877         case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
 878         case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
 879         case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
 880                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_EVENT_V2;
 881                 config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
 882                 is_l2 = true;
 883                 is_l4 = true;
 884                 break;
 885         case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
 886         case HWTSTAMP_FILTER_ALL:
 887                 /* 82576 cannot timestamp all packets, which it needs to do to
 888                  * support both V1 Sync and Delay_Req messages
 889                  */
 890                 if (hw->mac.type != e1000_82576) {
 891                         tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_ALL;
 892                         config->rx_filter = HWTSTAMP_FILTER_ALL;
 893                         break;
 894                 }
 895                 /* fall through */
 896         default:
 897                 config->rx_filter = HWTSTAMP_FILTER_NONE;
 898                 return -ERANGE;
 899         }
 900
 901         if (hw->mac.type == e1000_82575) {
 902                 if (tsync_rx_ctl | tsync_tx_ctl)
 903                         return -EINVAL;
 904                 return 0;
 905         }
 906
 907         /* Per-packet timestamping only works if all packets are
 908          * timestamped, so enable timestamping in all packets as
 909          * long as one Rx filter was configured.
 910          */
 911         if ((hw->mac.type >= e1000_82580) && tsync_rx_ctl) {
 912                 tsync_rx_ctl = E1000_TSYNCRXCTL_ENABLED;
 913                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_ALL;
 914                 config->rx_filter = HWTSTAMP_FILTER_ALL;
 915                 is_l2 = true;
 916                 is_l4 = true;
 917
 918                 if ((hw->mac.type == e1000_i210) ||
 919                     (hw->mac.type == e1000_i211)) {
 920                         regval = rd32(E1000_RXPBS);
 921                         regval |= E1000_RXPBS_CFG_TS_EN;
 922                         wr32(E1000_RXPBS, regval);
 923                 }
 924         }
 925
 926         /* enable/disable TX */
 927         regval = rd32(E1000_TSYNCTXCTL);
 928         regval &= ~E1000_TSYNCTXCTL_ENABLED;
 929         regval |= tsync_tx_ctl;
 930         wr32(E1000_TSYNCTXCTL, regval);
 931
 932         /* enable/disable RX */
 933         regval = rd32(E1000_TSYNCRXCTL);
 934         regval &= ~(E1000_TSYNCRXCTL_ENABLED | E1000_TSYNCRXCTL_TYPE_MASK);
 935         regval |= tsync_rx_ctl;
 936         wr32(E1000_TSYNCRXCTL, regval);
 937
 938         /* define which PTP packets are time stamped */
 939         wr32(E1000_TSYNCRXCFG, tsync_rx_cfg);
 940
 941         /* define ethertype filter for timestamped packets */
 942         if (is_l2)
 943                 wr32(E1000_ETQF(3),
 944                      (E1000_ETQF_FILTER_ENABLE | /* enable filter */
 945                       E1000_ETQF_1588 | /* enable timestamping */
 946                       ETH_P_1588));     /* 1588 eth protocol type */
 947         else
 948                 wr32(E1000_ETQF(3), 0);
 949
 950         /* L4 Queue Filter[3]: filter by destination port and protocol */
 951         if (is_l4) {
 952                 u32 ftqf = (IPPROTO_UDP /* UDP */
 953                         | E1000_FTQF_VF_BP /* VF not compared */
 954                         | E1000_FTQF_1588_TIME_STAMP /* Enable Timestamping */
 955                         | E1000_FTQF_MASK); /* mask all inputs */
 956                 ftqf &= ~E1000_FTQF_MASK_PROTO_BP; /* enable protocol check */
 957
 958                 wr32(E1000_IMIR(3), htons(PTP_EV_PORT));
 959                 wr32(E1000_IMIREXT(3),
 960                      (E1000_IMIREXT_SIZE_BP | E1000_IMIREXT_CTRL_BP));
 961                 if (hw->mac.type == e1000_82576) {
 962                         /* enable source port check */
 963                         wr32(E1000_SPQF(3), htons(PTP_EV_PORT));
 964                         ftqf &= ~E1000_FTQF_MASK_SOURCE_PORT_BP;
 965                 }
 966                 wr32(E1000_FTQF(3), ftqf);
 967         } else {
 968                 wr32(E1000_FTQF(3), E1000_FTQF_MASK);
 969         }
 970         wrfl();
 971
 972         /* clear TX/RX time stamp registers, just to be sure */
 973         regval = rd32(E1000_TXSTMPL);
 974         regval = rd32(E1000_TXSTMPH);
 975         regval = rd32(E1000_RXSTMPL);
 976         regval = rd32(E1000_RXSTMPH);
 977
 978         return 0;
 979 }
 980
 981 /**
 982  * igb_ptp_set_ts_config - set hardware time stamping config
 983  * @netdev:
 984  * @ifreq:
 985  *
 986  **/
 987 int igb_ptp_set_ts_config(struct net_device *netdev, struct ifreq *ifr)
 988 {
 989         struct igb_adapter *adapter = netdev_priv(netdev);
 990         struct hwtstamp_config config;
 991         int err;
 992
 993         if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
 994                 return -EFAULT;
 995
 996         err = igb_ptp_set_timestamp_mode(adapter, &config);
 997         if (err)
 998                 return err;
 999
1000         /* save these settings for future reference */
1001         memcpy(&adapter->tstamp_config, &config,
1002                sizeof(adapter->tstamp_config));
1003
1004         return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
1005                 -EFAULT : 0;
1006 }
1007
1008 void igb_ptp_init(struct igb_adapter *adapter)
1009 {
1010         struct e1000_hw *hw = &adapter->hw;
1011         struct net_device *netdev = adapter->netdev;
1012         int i;
1013
1014         switch (hw->mac.type) {
1015         case e1000_82576:
1016                 snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
1017                 adapter->ptp_caps.owner = THIS_MODULE;
1018                 adapter->ptp_caps.max_adj = 999999881;
1019                 adapter->ptp_caps.n_ext_ts = 0;
1020                 adapter->ptp_caps.pps = 0;
1021                 adapter->ptp_caps.adjfreq = igb_ptp_adjfreq_82576;
1022                 adapter->ptp_caps.adjtime = igb_ptp_adjtime_82576;
1023                 adapter->ptp_caps.gettime64 = igb_ptp_gettime_82576;
1024                 adapter->ptp_caps.settime64 = igb_ptp_settime_82576;
1025                 adapter->ptp_caps.enable = igb_ptp_feature_enable;
1026                 adapter->cc.read = igb_ptp_read_82576;
1027                 adapter->cc.mask = CYCLECOUNTER_MASK(64);
1028                 adapter->cc.mult = 1;
1029                 adapter->cc.shift = IGB_82576_TSYNC_SHIFT;
1030                 /* Dial the nominal frequency. */
1031                 wr32(E1000_TIMINCA, INCPERIOD_82576 | INCVALUE_82576);
1032                 break;
1033         case e1000_82580:
1034         case e1000_i354:
1035         case e1000_i350:
1036                 snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
1037                 adapter->ptp_caps.owner = THIS_MODULE;
1038                 adapter->ptp_caps.max_adj = 62499999;
1039                 adapter->ptp_caps.n_ext_ts = 0;
1040                 adapter->ptp_caps.pps = 0;
1041                 adapter->ptp_caps.adjfreq = igb_ptp_adjfreq_82580;
1042                 adapter->ptp_caps.adjtime = igb_ptp_adjtime_82576;
1043                 adapter->ptp_caps.gettime64 = igb_ptp_gettime_82576;
1044                 adapter->ptp_caps.settime64 = igb_ptp_settime_82576;
1045                 adapter->ptp_caps.enable = igb_ptp_feature_enable;
1046                 adapter->cc.read = igb_ptp_read_82580;
1047                 adapter->cc.mask = CYCLECOUNTER_MASK(IGB_NBITS_82580);
1048                 adapter->cc.mult = 1;
1049                 adapter->cc.shift = 0;
1050                 /* Enable the timer functions by clearing bit 31. */
1051                 wr32(E1000_TSAUXC, 0x0);
1052                 break;
1053         case e1000_i210:
1054         case e1000_i211:
1055                 for (i = 0; i < IGB_N_SDP; i++) {
1056                         struct ptp_pin_desc *ppd = &adapter->sdp_config[i];
1057
1058                         snprintf(ppd->name, sizeof(ppd->name), "SDP%d", i);
1059                         ppd->index = i;
1060                         ppd->func = PTP_PF_NONE;
1061                 }
1062                 snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
1063                 adapter->ptp_caps.owner = THIS_MODULE;
1064                 adapter->ptp_caps.max_adj = 62499999;
1065                 adapter->ptp_caps.n_ext_ts = IGB_N_EXTTS;
1066                 adapter->ptp_caps.n_per_out = IGB_N_PEROUT;
1067                 adapter->ptp_caps.n_pins = IGB_N_SDP;
1068                 adapter->ptp_caps.pps = 1;
1069                 adapter->ptp_caps.pin_config = adapter->sdp_config;
1070                 adapter->ptp_caps.adjfreq = igb_ptp_adjfreq_82580;
1071                 adapter->ptp_caps.adjtime = igb_ptp_adjtime_i210;
1072                 adapter->ptp_caps.gettime64 = igb_ptp_gettime_i210;
1073                 adapter->ptp_caps.settime64 = igb_ptp_settime_i210;
1074                 adapter->ptp_caps.enable = igb_ptp_feature_enable_i210;
1075                 adapter->ptp_caps.verify = igb_ptp_verify_pin;
1076                 /* Enable the timer functions by clearing bit 31. */
1077                 wr32(E1000_TSAUXC, 0x0);
1078                 break;
1079         default:
1080                 adapter->ptp_clock = NULL;
1081                 return;
1082         }
1083
1084         wrfl();
1085
1086         spin_lock_init(&adapter->tmreg_lock);
1087         INIT_WORK(&adapter->ptp_tx_work, igb_ptp_tx_work);
1088
1089         /* Initialize the clock and overflow work for devices that need it. */
1090         if ((hw->mac.type == e1000_i210) || (hw->mac.type == e1000_i211)) {
1091                 struct timespec64 ts = ktime_to_timespec64(ktime_get_real());
1092
1093                 igb_ptp_settime_i210(&adapter->ptp_caps, &ts);
1094         } else {
1095                 timecounter_init(&adapter->tc, &adapter->cc,
1096                                  ktime_to_ns(ktime_get_real()));
1097
1098                 INIT_DELAYED_WORK(&adapter->ptp_overflow_work,
1099                                   igb_ptp_overflow_check);
1100
1101                 schedule_delayed_work(&adapter->ptp_overflow_work,
1102                                       IGB_SYSTIM_OVERFLOW_PERIOD);
1103         }
1104
1105         /* Initialize the time sync interrupts for devices that support it. */
1106         if (hw->mac.type >= e1000_82580) {
1107                 wr32(E1000_TSIM, TSYNC_INTERRUPTS);
1108                 wr32(E1000_IMS, E1000_IMS_TS);
1109         }
1110
1111         adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
1112         adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
1113
1114         adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps,
1115                                                 &adapter->pdev->dev);
1116         if (IS_ERR(adapter->ptp_clock)) {
1117                 adapter->ptp_clock = NULL;
1118                 dev_err(&adapter->pdev->dev, "ptp_clock_register failed\n");
1119         } else {
1120                 dev_info(&adapter->pdev->dev, "added PHC on %s\n",
1121                          adapter->netdev->name);
1122                 adapter->flags |= IGB_FLAG_PTP;
1123         }
1124 }
1125
1126 /**
1127  * igb_ptp_stop - Disable PTP device and stop the overflow check.
1128  * @adapter: Board private structure.
1129  *
1130  * This function stops the PTP support and cancels the delayed work.
1131  **/
1132 void igb_ptp_stop(struct igb_adapter *adapter)
1133 {
1134         switch (adapter->hw.mac.type) {
1135         case e1000_82576:
1136         case e1000_82580:
1137         case e1000_i354:
1138         case e1000_i350:
1139                 cancel_delayed_work_sync(&adapter->ptp_overflow_work);
1140                 break;
1141         case e1000_i210:
1142         case e1000_i211:
1143                 /* No delayed work to cancel. */
1144                 break;
1145         default:
1146                 return;
1147         }
1148
1149         cancel_work_sync(&adapter->ptp_tx_work);
1150         if (adapter->ptp_tx_skb) {
1151                 dev_kfree_skb_any(adapter->ptp_tx_skb);
1152                 adapter->ptp_tx_skb = NULL;
1153                 clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
1154         }
1155
1156         if (adapter->ptp_clock) {
1157                 ptp_clock_unregister(adapter->ptp_clock);
1158                 dev_info(&adapter->pdev->dev, "removed PHC on %s\n",
1159                          adapter->netdev->name);
1160                 adapter->flags &= ~IGB_FLAG_PTP;
1161         }
1162 }
1163
1164 /**
1165  * igb_ptp_reset - Re-enable the adapter for PTP following a reset.
1166  * @adapter: Board private structure.
1167  *
1168  * This function handles the reset work required to re-enable the PTP device.
1169  **/
1170 void igb_ptp_reset(struct igb_adapter *adapter)
1171 {
1172         struct e1000_hw *hw = &adapter->hw;
1173         unsigned long flags;
1174
1175         if (!(adapter->flags & IGB_FLAG_PTP))
1176                 return;
1177
1178         /* reset the tstamp_config */
1179         igb_ptp_set_timestamp_mode(adapter, &adapter->tstamp_config);
1180
1181         spin_lock_irqsave(&adapter->tmreg_lock, flags);
1182
1183         switch (adapter->hw.mac.type) {
1184         case e1000_82576:
1185                 /* Dial the nominal frequency. */
1186                 wr32(E1000_TIMINCA, INCPERIOD_82576 | INCVALUE_82576);
1187                 break;
1188         case e1000_82580:
1189         case e1000_i354:
1190         case e1000_i350:
1191         case e1000_i210:
1192         case e1000_i211:
1193                 wr32(E1000_TSAUXC, 0x0);
1194                 wr32(E1000_TSSDP, 0x0);
1195                 wr32(E1000_TSIM, TSYNC_INTERRUPTS);
1196                 wr32(E1000_IMS, E1000_IMS_TS);
1197                 break;
1198         default:
1199                 /* No work to do. */
1200                 goto out;
1201         }
1202
1203         /* Re-initialize the timer. */
1204         if ((hw->mac.type == e1000_i210) || (hw->mac.type == e1000_i211)) {
1205                 struct timespec64 ts = ktime_to_timespec64(ktime_get_real());
1206
1207                 igb_ptp_write_i210(adapter, &ts);
1208         } else {
1209                 timecounter_init(&adapter->tc, &adapter->cc,
1210                                  ktime_to_ns(ktime_get_real()));
1211         }
1212 out:
1213         spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
1214 }