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

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com> */
   3
   4 #include <linux/module.h>
   5 #include <linux/device.h>
   6 #include <linux/pci.h>
   7 #include <linux/ptp_classify.h>
   8
   9 #include "igb.h"
  10
  11 #define INCVALUE_MASK           0x7fffffff
  12 #define ISGN                    0x80000000
  13
  14 /* The 82580 timesync updates the system timer every 8ns by 8ns,
  15  * and this update value cannot be reprogrammed.
  16  *
  17  * Neither the 82576 nor the 82580 offer registers wide enough to hold
  18  * nanoseconds time values for very long. For the 82580, SYSTIM always
  19  * counts nanoseconds, but the upper 24 bits are not available. The
  20  * frequency is adjusted by changing the 32 bit fractional nanoseconds
  21  * register, TIMINCA.
  22  *
  23  * For the 82576, the SYSTIM register time unit is affect by the
  24  * choice of the 24 bit TININCA:IV (incvalue) field. Five bits of this
  25  * field are needed to provide the nominal 16 nanosecond period,
  26  * leaving 19 bits for fractional nanoseconds.
  27  *
  28  * We scale the NIC clock cycle by a large factor so that relatively
  29  * small clock corrections can be added or subtracted at each clock
  30  * tick. The drawbacks of a large factor are a) that the clock
  31  * register overflows more quickly (not such a big deal) and b) that
  32  * the increment per tick has to fit into 24 bits.  As a result we
  33  * need to use a shift of 19 so we can fit a value of 16 into the
  34  * TIMINCA register.
  35  *
  36  *
  37  *             SYSTIMH            SYSTIML
  38  *        +--------------+   +---+---+------+
  39  *  82576 |      32      |   | 8 | 5 |  19  |
  40  *        +--------------+   +---+---+------+
  41  *         \________ 45 bits _______/  fract
  42  *
  43  *        +----------+---+   +--------------+
  44  *  82580 |    24    | 8 |   |      32      |
  45  *        +----------+---+   +--------------+
  46  *          reserved  \______ 40 bits _____/
  47  *
  48  *
  49  * The 45 bit 82576 SYSTIM overflows every
  50  *   2^45 * 10^-9 / 3600 = 9.77 hours.
  51  *
  52  * The 40 bit 82580 SYSTIM overflows every
  53  *   2^40 * 10^-9 /  60  = 18.3 minutes.
  54  *
  55  * SYSTIM is converted to real time using a timecounter. As
  56  * timecounter_cyc2time() allows old timestamps, the timecounter needs
  57  * to be updated at least once per half of the SYSTIM interval.
  58  * Scheduling of delayed work is not very accurate, and also the NIC
  59  * clock can be adjusted to run up to 6% faster and the system clock
  60  * up to 10% slower, so we aim for 6 minutes to be sure the actual
  61  * interval in the NIC time is shorter than 9.16 minutes.
  62  */
  63
  64 #define IGB_SYSTIM_OVERFLOW_PERIOD      (HZ * 60 * 6)
  65 #define IGB_PTP_TX_TIMEOUT              (HZ * 15)
  66 #define INCPERIOD_82576                 BIT(E1000_TIMINCA_16NS_SHIFT)
  67 #define INCVALUE_82576_MASK             GENMASK(E1000_TIMINCA_16NS_SHIFT - 1, 0)
  68 #define INCVALUE_82576                  (16u << IGB_82576_TSYNC_SHIFT)
  69 #define IGB_NBITS_82580                 40
  70 #define IGB_82580_BASE_PERIOD           0x800000000
  71
  72 static void igb_ptp_tx_hwtstamp(struct igb_adapter *adapter);
  73 static void igb_ptp_sdp_init(struct igb_adapter *adapter);
  74
  75 /* SYSTIM read access for the 82576 */
  76 static u64 igb_ptp_read_82576(const struct cyclecounter *cc)
  77 {
  78         struct igb_adapter *igb = container_of(cc, struct igb_adapter, cc);
  79         struct e1000_hw *hw = &igb->hw;
  80         u64 val;
  81         u32 lo, hi;
  82
  83         lo = rd32(E1000_SYSTIML);
  84         hi = rd32(E1000_SYSTIMH);
  85
  86         val = ((u64) hi) << 32;
  87         val |= lo;
  88
  89         return val;
  90 }
  91
  92 /* SYSTIM read access for the 82580 */
  93 static u64 igb_ptp_read_82580(const struct cyclecounter *cc)
  94 {
  95         struct igb_adapter *igb = container_of(cc, struct igb_adapter, cc);
  96         struct e1000_hw *hw = &igb->hw;
  97         u32 lo, hi;
  98         u64 val;
  99
 100         /* The timestamp latches on lowest register read. For the 82580
 101          * the lowest register is SYSTIMR instead of SYSTIML.  However we only
 102          * need to provide nanosecond resolution, so we just ignore it.
 103          */
 104         rd32(E1000_SYSTIMR);
 105         lo = rd32(E1000_SYSTIML);
 106         hi = rd32(E1000_SYSTIMH);
 107
 108         val = ((u64) hi) << 32;
 109         val |= lo;
 110
 111         return val;
 112 }
 113
 114 /* SYSTIM read access for I210/I211 */
 115 static void igb_ptp_read_i210(struct igb_adapter *adapter,
 116                               struct timespec64 *ts)
 117 {
 118         struct e1000_hw *hw = &adapter->hw;
 119         u32 sec, nsec;
 120
 121         /* The timestamp latches on lowest register read. For I210/I211, the
 122          * lowest register is SYSTIMR. Since we only need to provide nanosecond
 123          * resolution, we can ignore it.
 124          */
 125         rd32(E1000_SYSTIMR);
 126         nsec = rd32(E1000_SYSTIML);
 127         sec = rd32(E1000_SYSTIMH);
 128
 129         ts->tv_sec = sec;
 130         ts->tv_nsec = nsec;
 131 }
 132
 133 static void igb_ptp_write_i210(struct igb_adapter *adapter,
 134                                const struct timespec64 *ts)
 135 {
 136         struct e1000_hw *hw = &adapter->hw;
 137
 138         /* Writing the SYSTIMR register is not necessary as it only provides
 139          * sub-nanosecond resolution.
 140          */
 141         wr32(E1000_SYSTIML, ts->tv_nsec);
 142         wr32(E1000_SYSTIMH, (u32)ts->tv_sec);
 143 }
 144
 145 /**
 146  * igb_ptp_systim_to_hwtstamp - convert system time value to hw timestamp
 147  * @adapter: board private structure
 148  * @hwtstamps: timestamp structure to update
 149  * @systim: unsigned 64bit system time value.
 150  *
 151  * We need to convert the system time value stored in the RX/TXSTMP registers
 152  * into a hwtstamp which can be used by the upper level timestamping functions.
 153  *
 154  * The 'tmreg_lock' spinlock is used to protect the consistency of the
 155  * system time value. This is needed because reading the 64 bit time
 156  * value involves reading two (or three) 32 bit registers. The first
 157  * read latches the value. Ditto for writing.
 158  *
 159  * In addition, here have extended the system time with an overflow
 160  * counter in software.
 161  **/
 162 static void igb_ptp_systim_to_hwtstamp(struct igb_adapter *adapter,
 163                                        struct skb_shared_hwtstamps *hwtstamps,
 164                                        u64 systim)
 165 {
 166         unsigned long flags;
 167         u64 ns;
 168
 169         memset(hwtstamps, 0, sizeof(*hwtstamps));
 170
 171         switch (adapter->hw.mac.type) {
 172         case e1000_82576:
 173         case e1000_82580:
 174         case e1000_i354:
 175         case e1000_i350:
 176                 spin_lock_irqsave(&adapter->tmreg_lock, flags);
 177                 ns = timecounter_cyc2time(&adapter->tc, systim);
 178                 spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
 179
 180                 hwtstamps->hwtstamp = ns_to_ktime(ns);
 181                 break;
 182         case e1000_i210:
 183         case e1000_i211:
 184                 /* Upper 32 bits contain s, lower 32 bits contain ns. */
 185                 hwtstamps->hwtstamp = ktime_set(systim >> 32,
 186                                                 systim & 0xFFFFFFFF);
 187                 break;
 188         default:
 189                 break;
 190         }
 191 }
 192
 193 /* PTP clock operations */
 194 static int igb_ptp_adjfine_82576(struct ptp_clock_info *ptp, long scaled_ppm)
 195 {
 196         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 197                                                ptp_caps);
 198         struct e1000_hw *hw = &igb->hw;
 199         u64 incvalue;
 200
 201         incvalue = adjust_by_scaled_ppm(INCVALUE_82576, scaled_ppm);
 202
 203         wr32(E1000_TIMINCA, INCPERIOD_82576 | (incvalue & INCVALUE_82576_MASK));
 204
 205         return 0;
 206 }
 207
 208 static int igb_ptp_adjfine_82580(struct ptp_clock_info *ptp, long scaled_ppm)
 209 {
 210         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 211                                                ptp_caps);
 212         struct e1000_hw *hw = &igb->hw;
 213         bool neg_adj;
 214         u64 rate;
 215         u32 inca;
 216
 217         neg_adj = diff_by_scaled_ppm(IGB_82580_BASE_PERIOD, scaled_ppm, &rate);
 218
 219         inca = rate & INCVALUE_MASK;
 220         if (neg_adj)
 221                 inca |= ISGN;
 222
 223         wr32(E1000_TIMINCA, inca);
 224
 225         return 0;
 226 }
 227
 228 static int igb_ptp_adjtime_82576(struct ptp_clock_info *ptp, s64 delta)
 229 {
 230         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 231                                                ptp_caps);
 232         unsigned long flags;
 233
 234         spin_lock_irqsave(&igb->tmreg_lock, flags);
 235         timecounter_adjtime(&igb->tc, delta);
 236         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 237
 238         return 0;
 239 }
 240
 241 static int igb_ptp_adjtime_i210(struct ptp_clock_info *ptp, s64 delta)
 242 {
 243         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 244                                                ptp_caps);
 245         unsigned long flags;
 246         struct timespec64 now, then = ns_to_timespec64(delta);
 247
 248         spin_lock_irqsave(&igb->tmreg_lock, flags);
 249
 250         igb_ptp_read_i210(igb, &now);
 251         now = timespec64_add(now, then);
 252         igb_ptp_write_i210(igb, (const struct timespec64 *)&now);
 253
 254         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 255
 256         return 0;
 257 }
 258
 259 static int igb_ptp_gettimex_82576(struct ptp_clock_info *ptp,
 260                                   struct timespec64 *ts,
 261                                   struct ptp_system_timestamp *sts)
 262 {
 263         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 264                                                ptp_caps);
 265         struct e1000_hw *hw = &igb->hw;
 266         unsigned long flags;
 267         u32 lo, hi;
 268         u64 ns;
 269
 270         spin_lock_irqsave(&igb->tmreg_lock, flags);
 271
 272         ptp_read_system_prets(sts);
 273         lo = rd32(E1000_SYSTIML);
 274         ptp_read_system_postts(sts);
 275         hi = rd32(E1000_SYSTIMH);
 276
 277         ns = timecounter_cyc2time(&igb->tc, ((u64)hi << 32) | lo);
 278
 279         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 280
 281         *ts = ns_to_timespec64(ns);
 282
 283         return 0;
 284 }
 285
 286 static int igb_ptp_gettimex_82580(struct ptp_clock_info *ptp,
 287                                   struct timespec64 *ts,
 288                                   struct ptp_system_timestamp *sts)
 289 {
 290         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 291                                                ptp_caps);
 292         struct e1000_hw *hw = &igb->hw;
 293         unsigned long flags;
 294         u32 lo, hi;
 295         u64 ns;
 296
 297         spin_lock_irqsave(&igb->tmreg_lock, flags);
 298
 299         ptp_read_system_prets(sts);
 300         rd32(E1000_SYSTIMR);
 301         ptp_read_system_postts(sts);
 302         lo = rd32(E1000_SYSTIML);
 303         hi = rd32(E1000_SYSTIMH);
 304
 305         ns = timecounter_cyc2time(&igb->tc, ((u64)hi << 32) | lo);
 306
 307         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 308
 309         *ts = ns_to_timespec64(ns);
 310
 311         return 0;
 312 }
 313
 314 static int igb_ptp_gettimex_i210(struct ptp_clock_info *ptp,
 315                                  struct timespec64 *ts,
 316                                  struct ptp_system_timestamp *sts)
 317 {
 318         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 319                                                ptp_caps);
 320         struct e1000_hw *hw = &igb->hw;
 321         unsigned long flags;
 322
 323         spin_lock_irqsave(&igb->tmreg_lock, flags);
 324
 325         ptp_read_system_prets(sts);
 326         rd32(E1000_SYSTIMR);
 327         ptp_read_system_postts(sts);
 328         ts->tv_nsec = rd32(E1000_SYSTIML);
 329         ts->tv_sec = rd32(E1000_SYSTIMH);
 330
 331         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 332
 333         return 0;
 334 }
 335
 336 static int igb_ptp_settime_82576(struct ptp_clock_info *ptp,
 337                                  const struct timespec64 *ts)
 338 {
 339         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 340                                                ptp_caps);
 341         unsigned long flags;
 342         u64 ns;
 343
 344         ns = timespec64_to_ns(ts);
 345
 346         spin_lock_irqsave(&igb->tmreg_lock, flags);
 347
 348         timecounter_init(&igb->tc, &igb->cc, ns);
 349
 350         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 351
 352         return 0;
 353 }
 354
 355 static int igb_ptp_settime_i210(struct ptp_clock_info *ptp,
 356                                 const struct timespec64 *ts)
 357 {
 358         struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
 359                                                ptp_caps);
 360         unsigned long flags;
 361
 362         spin_lock_irqsave(&igb->tmreg_lock, flags);
 363
 364         igb_ptp_write_i210(igb, ts);
 365
 366         spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 367
 368         return 0;
 369 }
 370
 371 static void igb_pin_direction(int pin, int input, u32 *ctrl, u32 *ctrl_ext)
 372 {
 373         u32 *ptr = pin < 2 ? ctrl : ctrl_ext;
 374         static const u32 mask[IGB_N_SDP] = {
 375                 E1000_CTRL_SDP0_DIR,
 376                 E1000_CTRL_SDP1_DIR,
 377                 E1000_CTRL_EXT_SDP2_DIR,
 378                 E1000_CTRL_EXT_SDP3_DIR,
 379         };
 380
 381         if (input)
 382                 *ptr &= ~mask[pin];
 383         else
 384                 *ptr |= mask[pin];
 385 }
 386
 387 static void igb_pin_extts(struct igb_adapter *igb, int chan, int pin)
 388 {
 389         static const u32 aux0_sel_sdp[IGB_N_SDP] = {
 390                 AUX0_SEL_SDP0, AUX0_SEL_SDP1, AUX0_SEL_SDP2, AUX0_SEL_SDP3,
 391         };
 392         static const u32 aux1_sel_sdp[IGB_N_SDP] = {
 393                 AUX1_SEL_SDP0, AUX1_SEL_SDP1, AUX1_SEL_SDP2, AUX1_SEL_SDP3,
 394         };
 395         static const u32 ts_sdp_en[IGB_N_SDP] = {
 396                 TS_SDP0_EN, TS_SDP1_EN, TS_SDP2_EN, TS_SDP3_EN,
 397         };
 398         struct e1000_hw *hw = &igb->hw;
 399         u32 ctrl, ctrl_ext, tssdp = 0;
 400
 401         ctrl = rd32(E1000_CTRL);
 402         ctrl_ext = rd32(E1000_CTRL_EXT);
 403         tssdp = rd32(E1000_TSSDP);
 404
 405         igb_pin_direction(pin, 1, &ctrl, &ctrl_ext);
 406
 407         /* Make sure this pin is not enabled as an output. */
 408         tssdp &= ~ts_sdp_en[pin];
 409
 410         if (chan == 1) {
 411                 tssdp &= ~AUX1_SEL_SDP3;
 412                 tssdp |= aux1_sel_sdp[pin] | AUX1_TS_SDP_EN;
 413         } else {
 414                 tssdp &= ~AUX0_SEL_SDP3;
 415                 tssdp |= aux0_sel_sdp[pin] | AUX0_TS_SDP_EN;
 416         }
 417
 418         wr32(E1000_TSSDP, tssdp);
 419         wr32(E1000_CTRL, ctrl);
 420         wr32(E1000_CTRL_EXT, ctrl_ext);
 421 }
 422
 423 static void igb_pin_perout(struct igb_adapter *igb, int chan, int pin, int freq)
 424 {
 425         static const u32 aux0_sel_sdp[IGB_N_SDP] = {
 426                 AUX0_SEL_SDP0, AUX0_SEL_SDP1, AUX0_SEL_SDP2, AUX0_SEL_SDP3,
 427         };
 428         static const u32 aux1_sel_sdp[IGB_N_SDP] = {
 429                 AUX1_SEL_SDP0, AUX1_SEL_SDP1, AUX1_SEL_SDP2, AUX1_SEL_SDP3,
 430         };
 431         static const u32 ts_sdp_en[IGB_N_SDP] = {
 432                 TS_SDP0_EN, TS_SDP1_EN, TS_SDP2_EN, TS_SDP3_EN,
 433         };
 434         static const u32 ts_sdp_sel_tt0[IGB_N_SDP] = {
 435                 TS_SDP0_SEL_TT0, TS_SDP1_SEL_TT0,
 436                 TS_SDP2_SEL_TT0, TS_SDP3_SEL_TT0,
 437         };
 438         static const u32 ts_sdp_sel_tt1[IGB_N_SDP] = {
 439                 TS_SDP0_SEL_TT1, TS_SDP1_SEL_TT1,
 440                 TS_SDP2_SEL_TT1, TS_SDP3_SEL_TT1,
 441         };
 442         static const u32 ts_sdp_sel_fc0[IGB_N_SDP] = {
 443                 TS_SDP0_SEL_FC0, TS_SDP1_SEL_FC0,
 444                 TS_SDP2_SEL_FC0, TS_SDP3_SEL_FC0,
 445         };
 446         static const u32 ts_sdp_sel_fc1[IGB_N_SDP] = {
 447                 TS_SDP0_SEL_FC1, TS_SDP1_SEL_FC1,
 448                 TS_SDP2_SEL_FC1, TS_SDP3_SEL_FC1,
 449         };
 450         static const u32 ts_sdp_sel_clr[IGB_N_SDP] = {
 451                 TS_SDP0_SEL_FC1, TS_SDP1_SEL_FC1,
 452                 TS_SDP2_SEL_FC1, TS_SDP3_SEL_FC1,
 453         };
 454         struct e1000_hw *hw = &igb->hw;
 455         u32 ctrl, ctrl_ext, tssdp = 0;
 456
 457         ctrl = rd32(E1000_CTRL);
 458         ctrl_ext = rd32(E1000_CTRL_EXT);
 459         tssdp = rd32(E1000_TSSDP);
 460
 461         igb_pin_direction(pin, 0, &ctrl, &ctrl_ext);
 462
 463         /* Make sure this pin is not enabled as an input. */
 464         if ((tssdp & AUX0_SEL_SDP3) == aux0_sel_sdp[pin])
 465                 tssdp &= ~AUX0_TS_SDP_EN;
 466
 467         if ((tssdp & AUX1_SEL_SDP3) == aux1_sel_sdp[pin])
 468                 tssdp &= ~AUX1_TS_SDP_EN;
 469
 470         tssdp &= ~ts_sdp_sel_clr[pin];
 471         if (freq) {
 472                 if (chan == 1)
 473                         tssdp |= ts_sdp_sel_fc1[pin];
 474                 else
 475                         tssdp |= ts_sdp_sel_fc0[pin];
 476         } else {
 477                 if (chan == 1)
 478                         tssdp |= ts_sdp_sel_tt1[pin];
 479                 else
 480                         tssdp |= ts_sdp_sel_tt0[pin];
 481         }
 482         tssdp |= ts_sdp_en[pin];
 483
 484         wr32(E1000_TSSDP, tssdp);
 485         wr32(E1000_CTRL, ctrl);
 486         wr32(E1000_CTRL_EXT, ctrl_ext);
 487 }
 488
 489 static int igb_ptp_feature_enable_82580(struct ptp_clock_info *ptp,
 490                                         struct ptp_clock_request *rq, int on)
 491 {
 492         struct igb_adapter *igb =
 493                 container_of(ptp, struct igb_adapter, ptp_caps);
 494         u32 tsauxc, tsim, tsauxc_mask, tsim_mask, trgttiml, trgttimh, systiml,
 495                 systimh, level_mask, level, rem;
 496         struct e1000_hw *hw = &igb->hw;
 497         struct timespec64 ts, start;
 498         unsigned long flags;
 499         u64 systim, now;
 500         int pin = -1;
 501         s64 ns;
 502
 503         switch (rq->type) {
 504         case PTP_CLK_REQ_EXTTS:
 505                 /* Reject requests with unsupported flags */
 506                 if (rq->extts.flags & ~(PTP_ENABLE_FEATURE |
 507                                         PTP_RISING_EDGE |
 508                                         PTP_FALLING_EDGE |
 509                                         PTP_STRICT_FLAGS))
 510                         return -EOPNOTSUPP;
 511
 512                 if (on) {
 513                         pin = ptp_find_pin(igb->ptp_clock, PTP_PF_EXTTS,
 514                                            rq->extts.index);
 515                         if (pin < 0)
 516                                 return -EBUSY;
 517                 }
 518                 if (rq->extts.index == 1) {
 519                         tsauxc_mask = TSAUXC_EN_TS1;
 520                         tsim_mask = TSINTR_AUTT1;
 521                 } else {
 522                         tsauxc_mask = TSAUXC_EN_TS0;
 523                         tsim_mask = TSINTR_AUTT0;
 524                 }
 525                 spin_lock_irqsave(&igb->tmreg_lock, flags);
 526                 tsauxc = rd32(E1000_TSAUXC);
 527                 tsim = rd32(E1000_TSIM);
 528                 if (on) {
 529                         igb_pin_extts(igb, rq->extts.index, pin);
 530                         tsauxc |= tsauxc_mask;
 531                         tsim |= tsim_mask;
 532                 } else {
 533                         tsauxc &= ~tsauxc_mask;
 534                         tsim &= ~tsim_mask;
 535                 }
 536                 wr32(E1000_TSAUXC, tsauxc);
 537                 wr32(E1000_TSIM, tsim);
 538                 spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 539                 return 0;
 540
 541         case PTP_CLK_REQ_PEROUT:
 542                 /* Reject requests with unsupported flags */
 543                 if (rq->perout.flags)
 544                         return -EOPNOTSUPP;
 545
 546                 if (on) {
 547                         pin = ptp_find_pin(igb->ptp_clock, PTP_PF_PEROUT,
 548                                            rq->perout.index);
 549                         if (pin < 0)
 550                                 return -EBUSY;
 551                 }
 552                 ts.tv_sec = rq->perout.period.sec;
 553                 ts.tv_nsec = rq->perout.period.nsec;
 554                 ns = timespec64_to_ns(&ts);
 555                 ns = ns >> 1;
 556                 if (on && ns < 8LL)
 557                         return -EINVAL;
 558                 ts = ns_to_timespec64(ns);
 559                 if (rq->perout.index == 1) {
 560                         tsauxc_mask = TSAUXC_EN_TT1;
 561                         tsim_mask = TSINTR_TT1;
 562                         trgttiml = E1000_TRGTTIML1;
 563                         trgttimh = E1000_TRGTTIMH1;
 564                 } else {
 565                         tsauxc_mask = TSAUXC_EN_TT0;
 566                         tsim_mask = TSINTR_TT0;
 567                         trgttiml = E1000_TRGTTIML0;
 568                         trgttimh = E1000_TRGTTIMH0;
 569                 }
 570                 spin_lock_irqsave(&igb->tmreg_lock, flags);
 571                 tsauxc = rd32(E1000_TSAUXC);
 572                 tsim = rd32(E1000_TSIM);
 573                 if (rq->perout.index == 1) {
 574                         tsauxc &= ~(TSAUXC_EN_TT1 | TSAUXC_EN_CLK1 | TSAUXC_ST1);
 575                         tsim &= ~TSINTR_TT1;
 576                 } else {
 577                         tsauxc &= ~(TSAUXC_EN_TT0 | TSAUXC_EN_CLK0 | TSAUXC_ST0);
 578                         tsim &= ~TSINTR_TT0;
 579                 }
 580                 if (on) {
 581                         int i = rq->perout.index;
 582
 583                         /* read systim registers in sequence */
 584                         rd32(E1000_SYSTIMR);
 585                         systiml = rd32(E1000_SYSTIML);
 586                         systimh = rd32(E1000_SYSTIMH);
 587                         systim = (((u64)(systimh & 0xFF)) << 32) | ((u64)systiml);
 588                         now = timecounter_cyc2time(&igb->tc, systim);
 589
 590                         if (pin < 2) {
 591                                 level_mask = (i == 1) ? 0x80000 : 0x40000;
 592                                 level = (rd32(E1000_CTRL) & level_mask) ? 1 : 0;
 593                         } else {
 594                                 level_mask = (i == 1) ? 0x80 : 0x40;
 595                                 level = (rd32(E1000_CTRL_EXT) & level_mask) ? 1 : 0;
 596                         }
 597
 598                         div_u64_rem(now, ns, &rem);
 599                         systim = systim + (ns - rem);
 600
 601                         /* synchronize pin level with rising/falling edges */
 602                         div_u64_rem(now, ns << 1, &rem);
 603                         if (rem < ns) {
 604                                 /* first half of period */
 605                                 if (level == 0) {
 606                                         /* output is already low, skip this period */
 607                                         systim += ns;
 608                                 }
 609                         } else {
 610                                 /* second half of period */
 611                                 if (level == 1) {
 612                                         /* output is already high, skip this period */
 613                                         systim += ns;
 614                                 }
 615                         }
 616
 617                         start = ns_to_timespec64(systim + (ns - rem));
 618                         igb_pin_perout(igb, i, pin, 0);
 619                         igb->perout[i].start.tv_sec = start.tv_sec;
 620                         igb->perout[i].start.tv_nsec = start.tv_nsec;
 621                         igb->perout[i].period.tv_sec = ts.tv_sec;
 622                         igb->perout[i].period.tv_nsec = ts.tv_nsec;
 623
 624                         wr32(trgttiml, (u32)systim);
 625                         wr32(trgttimh, ((u32)(systim >> 32)) & 0xFF);
 626                         tsauxc |= tsauxc_mask;
 627                         tsim |= tsim_mask;
 628                 }
 629                 wr32(E1000_TSAUXC, tsauxc);
 630                 wr32(E1000_TSIM, tsim);
 631                 spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 632                 return 0;
 633
 634         case PTP_CLK_REQ_PPS:
 635                 return -EOPNOTSUPP;
 636         }
 637
 638         return -EOPNOTSUPP;
 639 }
 640
 641 static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp,
 642                                        struct ptp_clock_request *rq, int on)
 643 {
 644         struct igb_adapter *igb =
 645                 container_of(ptp, struct igb_adapter, ptp_caps);
 646         struct e1000_hw *hw = &igb->hw;
 647         u32 tsauxc, tsim, tsauxc_mask, tsim_mask, trgttiml, trgttimh, freqout;
 648         unsigned long flags;
 649         struct timespec64 ts;
 650         int use_freq = 0, pin = -1;
 651         s64 ns;
 652
 653         switch (rq->type) {
 654         case PTP_CLK_REQ_EXTTS:
 655                 /* Reject requests with unsupported flags */
 656                 if (rq->extts.flags & ~(PTP_ENABLE_FEATURE |
 657                                         PTP_RISING_EDGE |
 658                                         PTP_FALLING_EDGE |
 659                                         PTP_STRICT_FLAGS))
 660                         return -EOPNOTSUPP;
 661
 662                 /* Reject requests failing to enable both edges. */
 663                 if ((rq->extts.flags & PTP_STRICT_FLAGS) &&
 664                     (rq->extts.flags & PTP_ENABLE_FEATURE) &&
 665                     (rq->extts.flags & PTP_EXTTS_EDGES) != PTP_EXTTS_EDGES)
 666                         return -EOPNOTSUPP;
 667
 668                 if (on) {
 669                         pin = ptp_find_pin(igb->ptp_clock, PTP_PF_EXTTS,
 670                                            rq->extts.index);
 671                         if (pin < 0)
 672                                 return -EBUSY;
 673                 }
 674                 if (rq->extts.index == 1) {
 675                         tsauxc_mask = TSAUXC_EN_TS1;
 676                         tsim_mask = TSINTR_AUTT1;
 677                 } else {
 678                         tsauxc_mask = TSAUXC_EN_TS0;
 679                         tsim_mask = TSINTR_AUTT0;
 680                 }
 681                 spin_lock_irqsave(&igb->tmreg_lock, flags);
 682                 tsauxc = rd32(E1000_TSAUXC);
 683                 tsim = rd32(E1000_TSIM);
 684                 if (on) {
 685                         igb_pin_extts(igb, rq->extts.index, pin);
 686                         tsauxc |= tsauxc_mask;
 687                         tsim |= tsim_mask;
 688                 } else {
 689                         tsauxc &= ~tsauxc_mask;
 690                         tsim &= ~tsim_mask;
 691                 }
 692                 wr32(E1000_TSAUXC, tsauxc);
 693                 wr32(E1000_TSIM, tsim);
 694                 spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 695                 return 0;
 696
 697         case PTP_CLK_REQ_PEROUT:
 698                 /* Reject requests with unsupported flags */
 699                 if (rq->perout.flags)
 700                         return -EOPNOTSUPP;
 701
 702                 if (on) {
 703                         pin = ptp_find_pin(igb->ptp_clock, PTP_PF_PEROUT,
 704                                            rq->perout.index);
 705                         if (pin < 0)
 706                                 return -EBUSY;
 707                 }
 708                 ts.tv_sec = rq->perout.period.sec;
 709                 ts.tv_nsec = rq->perout.period.nsec;
 710                 ns = timespec64_to_ns(&ts);
 711                 ns = ns >> 1;
 712                 if (on && ((ns <= 70000000LL) || (ns == 125000000LL) ||
 713                            (ns == 250000000LL) || (ns == 500000000LL))) {
 714                         if (ns < 8LL)
 715                                 return -EINVAL;
 716                         use_freq = 1;
 717                 }
 718                 ts = ns_to_timespec64(ns);
 719                 if (rq->perout.index == 1) {
 720                         if (use_freq) {
 721                                 tsauxc_mask = TSAUXC_EN_CLK1 | TSAUXC_ST1;
 722                                 tsim_mask = 0;
 723                         } else {
 724                                 tsauxc_mask = TSAUXC_EN_TT1;
 725                                 tsim_mask = TSINTR_TT1;
 726                         }
 727                         trgttiml = E1000_TRGTTIML1;
 728                         trgttimh = E1000_TRGTTIMH1;
 729                         freqout = E1000_FREQOUT1;
 730                 } else {
 731                         if (use_freq) {
 732                                 tsauxc_mask = TSAUXC_EN_CLK0 | TSAUXC_ST0;
 733                                 tsim_mask = 0;
 734                         } else {
 735                                 tsauxc_mask = TSAUXC_EN_TT0;
 736                                 tsim_mask = TSINTR_TT0;
 737                         }
 738                         trgttiml = E1000_TRGTTIML0;
 739                         trgttimh = E1000_TRGTTIMH0;
 740                         freqout = E1000_FREQOUT0;
 741                 }
 742                 spin_lock_irqsave(&igb->tmreg_lock, flags);
 743                 tsauxc = rd32(E1000_TSAUXC);
 744                 tsim = rd32(E1000_TSIM);
 745                 if (rq->perout.index == 1) {
 746                         tsauxc &= ~(TSAUXC_EN_TT1 | TSAUXC_EN_CLK1 | TSAUXC_ST1);
 747                         tsim &= ~TSINTR_TT1;
 748                 } else {
 749                         tsauxc &= ~(TSAUXC_EN_TT0 | TSAUXC_EN_CLK0 | TSAUXC_ST0);
 750                         tsim &= ~TSINTR_TT0;
 751                 }
 752                 if (on) {
 753                         int i = rq->perout.index;
 754                         igb_pin_perout(igb, i, pin, use_freq);
 755                         igb->perout[i].start.tv_sec = rq->perout.start.sec;
 756                         igb->perout[i].start.tv_nsec = rq->perout.start.nsec;
 757                         igb->perout[i].period.tv_sec = ts.tv_sec;
 758                         igb->perout[i].period.tv_nsec = ts.tv_nsec;
 759                         wr32(trgttimh, rq->perout.start.sec);
 760                         wr32(trgttiml, rq->perout.start.nsec);
 761                         if (use_freq)
 762                                 wr32(freqout, ns);
 763                         tsauxc |= tsauxc_mask;
 764                         tsim |= tsim_mask;
 765                 }
 766                 wr32(E1000_TSAUXC, tsauxc);
 767                 wr32(E1000_TSIM, tsim);
 768                 spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 769                 return 0;
 770
 771         case PTP_CLK_REQ_PPS:
 772                 spin_lock_irqsave(&igb->tmreg_lock, flags);
 773                 tsim = rd32(E1000_TSIM);
 774                 if (on)
 775                         tsim |= TSINTR_SYS_WRAP;
 776                 else
 777                         tsim &= ~TSINTR_SYS_WRAP;
 778                 igb->pps_sys_wrap_on = !!on;
 779                 wr32(E1000_TSIM, tsim);
 780                 spin_unlock_irqrestore(&igb->tmreg_lock, flags);
 781                 return 0;
 782         }
 783
 784         return -EOPNOTSUPP;
 785 }
 786
 787 static int igb_ptp_feature_enable(struct ptp_clock_info *ptp,
 788                                   struct ptp_clock_request *rq, int on)
 789 {
 790         return -EOPNOTSUPP;
 791 }
 792
 793 static int igb_ptp_verify_pin(struct ptp_clock_info *ptp, unsigned int pin,
 794                               enum ptp_pin_function func, unsigned int chan)
 795 {
 796         switch (func) {
 797         case PTP_PF_NONE:
 798         case PTP_PF_EXTTS:
 799         case PTP_PF_PEROUT:
 800                 break;
 801         case PTP_PF_PHYSYNC:
 802                 return -1;
 803         }
 804         return 0;
 805 }
 806
 807 /**
 808  * igb_ptp_tx_work
 809  * @work: pointer to work struct
 810  *
 811  * This work function polls the TSYNCTXCTL valid bit to determine when a
 812  * timestamp has been taken for the current stored skb.
 813  **/
 814 static void igb_ptp_tx_work(struct work_struct *work)
 815 {
 816         struct igb_adapter *adapter = container_of(work, struct igb_adapter,
 817                                                    ptp_tx_work);
 818         struct e1000_hw *hw = &adapter->hw;
 819         u32 tsynctxctl;
 820
 821         if (!adapter->ptp_tx_skb)
 822                 return;
 823
 824         if (time_is_before_jiffies(adapter->ptp_tx_start +
 825                                    IGB_PTP_TX_TIMEOUT)) {
 826                 dev_kfree_skb_any(adapter->ptp_tx_skb);
 827                 adapter->ptp_tx_skb = NULL;
 828                 clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
 829                 adapter->tx_hwtstamp_timeouts++;
 830                 /* Clear the tx valid bit in TSYNCTXCTL register to enable
 831                  * interrupt
 832                  */
 833                 rd32(E1000_TXSTMPH);
 834                 dev_warn(&adapter->pdev->dev, "clearing Tx timestamp hang\n");
 835                 return;
 836         }
 837
 838         tsynctxctl = rd32(E1000_TSYNCTXCTL);
 839         if (tsynctxctl & E1000_TSYNCTXCTL_VALID)
 840                 igb_ptp_tx_hwtstamp(adapter);
 841         else
 842                 /* reschedule to check later */
 843                 schedule_work(&adapter->ptp_tx_work);
 844 }
 845
 846 static void igb_ptp_overflow_check(struct work_struct *work)
 847 {
 848         struct igb_adapter *igb =
 849                 container_of(work, struct igb_adapter, ptp_overflow_work.work);
 850         struct timespec64 ts;
 851         u64 ns;
 852
 853         /* Update the timecounter */
 854         ns = timecounter_read(&igb->tc);
 855
 856         ts = ns_to_timespec64(ns);
 857         pr_debug("igb overflow check at %lld.%09lu\n",
 858                  (long long) ts.tv_sec, ts.tv_nsec);
 859
 860         schedule_delayed_work(&igb->ptp_overflow_work,
 861                               IGB_SYSTIM_OVERFLOW_PERIOD);
 862 }
 863
 864 /**
 865  * igb_ptp_rx_hang - detect error case when Rx timestamp registers latched
 866  * @adapter: private network adapter structure
 867  *
 868  * This watchdog task is scheduled to detect error case where hardware has
 869  * dropped an Rx packet that was timestamped when the ring is full. The
 870  * particular error is rare but leaves the device in a state unable to timestamp
 871  * any future packets.
 872  **/
 873 void igb_ptp_rx_hang(struct igb_adapter *adapter)
 874 {
 875         struct e1000_hw *hw = &adapter->hw;
 876         u32 tsyncrxctl = rd32(E1000_TSYNCRXCTL);
 877         unsigned long rx_event;
 878
 879         /* Other hardware uses per-packet timestamps */
 880         if (hw->mac.type != e1000_82576)
 881                 return;
 882
 883         /* If we don't have a valid timestamp in the registers, just update the
 884          * timeout counter and exit
 885          */
 886         if (!(tsyncrxctl & E1000_TSYNCRXCTL_VALID)) {
 887                 adapter->last_rx_ptp_check = jiffies;
 888                 return;
 889         }
 890
 891         /* Determine the most recent watchdog or rx_timestamp event */
 892         rx_event = adapter->last_rx_ptp_check;
 893         if (time_after(adapter->last_rx_timestamp, rx_event))
 894                 rx_event = adapter->last_rx_timestamp;
 895
 896         /* Only need to read the high RXSTMP register to clear the lock */
 897         if (time_is_before_jiffies(rx_event + 5 * HZ)) {
 898                 rd32(E1000_RXSTMPH);
 899                 adapter->last_rx_ptp_check = jiffies;
 900                 adapter->rx_hwtstamp_cleared++;
 901                 dev_warn(&adapter->pdev->dev, "clearing Rx timestamp hang\n");
 902         }
 903 }
 904
 905 /**
 906  * igb_ptp_tx_hang - detect error case where Tx timestamp never finishes
 907  * @adapter: private network adapter structure
 908  */
 909 void igb_ptp_tx_hang(struct igb_adapter *adapter)
 910 {
 911         struct e1000_hw *hw = &adapter->hw;
 912         bool timeout = time_is_before_jiffies(adapter->ptp_tx_start +
 913                                               IGB_PTP_TX_TIMEOUT);
 914
 915         if (!adapter->ptp_tx_skb)
 916                 return;
 917
 918         if (!test_bit(__IGB_PTP_TX_IN_PROGRESS, &adapter->state))
 919                 return;
 920
 921         /* If we haven't received a timestamp within the timeout, it is
 922          * reasonable to assume that it will never occur, so we can unlock the
 923          * timestamp bit when this occurs.
 924          */
 925         if (timeout) {
 926                 cancel_work_sync(&adapter->ptp_tx_work);
 927                 dev_kfree_skb_any(adapter->ptp_tx_skb);
 928                 adapter->ptp_tx_skb = NULL;
 929                 clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
 930                 adapter->tx_hwtstamp_timeouts++;
 931                 /* Clear the tx valid bit in TSYNCTXCTL register to enable
 932                  * interrupt
 933                  */
 934                 rd32(E1000_TXSTMPH);
 935                 dev_warn(&adapter->pdev->dev, "clearing Tx timestamp hang\n");
 936         }
 937 }
 938
 939 /**
 940  * igb_ptp_tx_hwtstamp - utility function which checks for TX time stamp
 941  * @adapter: Board private structure.
 942  *
 943  * If we were asked to do hardware stamping and such a time stamp is
 944  * available, then it must have been for this skb here because we only
 945  * allow only one such packet into the queue.
 946  **/
 947 static void igb_ptp_tx_hwtstamp(struct igb_adapter *adapter)
 948 {
 949         struct sk_buff *skb = adapter->ptp_tx_skb;
 950         struct e1000_hw *hw = &adapter->hw;
 951         struct skb_shared_hwtstamps shhwtstamps;
 952         u64 regval;
 953         int adjust = 0;
 954
 955         regval = rd32(E1000_TXSTMPL);
 956         regval |= (u64)rd32(E1000_TXSTMPH) << 32;
 957
 958         igb_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval);
 959         /* adjust timestamp for the TX latency based on link speed */
 960         if (adapter->hw.mac.type == e1000_i210) {
 961                 switch (adapter->link_speed) {
 962                 case SPEED_10:
 963                         adjust = IGB_I210_TX_LATENCY_10;
 964                         break;
 965                 case SPEED_100:
 966                         adjust = IGB_I210_TX_LATENCY_100;
 967                         break;
 968                 case SPEED_1000:
 969                         adjust = IGB_I210_TX_LATENCY_1000;
 970                         break;
 971                 }
 972         }
 973
 974         shhwtstamps.hwtstamp =
 975                 ktime_add_ns(shhwtstamps.hwtstamp, adjust);
 976
 977         /* Clear the lock early before calling skb_tstamp_tx so that
 978          * applications are not woken up before the lock bit is clear. We use
 979          * a copy of the skb pointer to ensure other threads can't change it
 980          * while we're notifying the stack.
 981          */
 982         adapter->ptp_tx_skb = NULL;
 983         clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
 984
 985         /* Notify the stack and free the skb after we've unlocked */
 986         skb_tstamp_tx(skb, &shhwtstamps);
 987         dev_kfree_skb_any(skb);
 988 }
 989
 990 /**
 991  * igb_ptp_rx_pktstamp - retrieve Rx per packet timestamp
 992  * @q_vector: Pointer to interrupt specific structure
 993  * @va: Pointer to address containing Rx buffer
 994  * @timestamp: Pointer where timestamp will be stored
 995  *
 996  * This function is meant to retrieve a timestamp from the first buffer of an
 997  * incoming frame.  The value is stored in little endian format starting on
 998  * byte 8
 999  *
1000  * Returns: The timestamp header length or 0 if not available
1001  **/
1002 int igb_ptp_rx_pktstamp(struct igb_q_vector *q_vector, void *va,
1003                         ktime_t *timestamp)
1004 {
1005         struct igb_adapter *adapter = q_vector->adapter;
1006         struct skb_shared_hwtstamps ts;
1007         __le64 *regval = (__le64 *)va;
1008         int adjust = 0;
1009
1010         if (!(adapter->ptp_flags & IGB_PTP_ENABLED))
1011                 return 0;
1012
1013         /* The timestamp is recorded in little endian format.
1014          * DWORD: 0        1        2        3
1015          * Field: Reserved Reserved SYSTIML  SYSTIMH
1016          */
1017
1018         /* check reserved dwords are zero, be/le doesn't matter for zero */
1019         if (regval[0])
1020                 return 0;
1021
1022         igb_ptp_systim_to_hwtstamp(adapter, &ts, le64_to_cpu(regval[1]));
1023
1024         /* adjust timestamp for the RX latency based on link speed */
1025         if (adapter->hw.mac.type == e1000_i210) {
1026                 switch (adapter->link_speed) {
1027                 case SPEED_10:
1028                         adjust = IGB_I210_RX_LATENCY_10;
1029                         break;
1030                 case SPEED_100:
1031                         adjust = IGB_I210_RX_LATENCY_100;
1032                         break;
1033                 case SPEED_1000:
1034                         adjust = IGB_I210_RX_LATENCY_1000;
1035                         break;
1036                 }
1037         }
1038
1039         *timestamp = ktime_sub_ns(ts.hwtstamp, adjust);
1040
1041         return IGB_TS_HDR_LEN;
1042 }
1043
1044 /**
1045  * igb_ptp_rx_rgtstamp - retrieve Rx timestamp stored in register
1046  * @q_vector: Pointer to interrupt specific structure
1047  * @skb: Buffer containing timestamp and packet
1048  *
1049  * This function is meant to retrieve a timestamp from the internal registers
1050  * of the adapter and store it in the skb.
1051  **/
1052 void igb_ptp_rx_rgtstamp(struct igb_q_vector *q_vector, struct sk_buff *skb)
1053 {
1054         struct igb_adapter *adapter = q_vector->adapter;
1055         struct e1000_hw *hw = &adapter->hw;
1056         int adjust = 0;
1057         u64 regval;
1058
1059         if (!(adapter->ptp_flags & IGB_PTP_ENABLED))
1060                 return;
1061
1062         /* If this bit is set, then the RX registers contain the time stamp. No
1063          * other packet will be time stamped until we read these registers, so
1064          * read the registers to make them available again. Because only one
1065          * packet can be time stamped at a time, we know that the register
1066          * values must belong to this one here and therefore we don't need to
1067          * compare any of the additional attributes stored for it.
1068          *
1069          * If nothing went wrong, then it should have a shared tx_flags that we
1070          * can turn into a skb_shared_hwtstamps.
1071          */
1072         if (!(rd32(E1000_TSYNCRXCTL) & E1000_TSYNCRXCTL_VALID))
1073                 return;
1074
1075         regval = rd32(E1000_RXSTMPL);
1076         regval |= (u64)rd32(E1000_RXSTMPH) << 32;
1077
1078         igb_ptp_systim_to_hwtstamp(adapter, skb_hwtstamps(skb), regval);
1079
1080         /* adjust timestamp for the RX latency based on link speed */
1081         if (adapter->hw.mac.type == e1000_i210) {
1082                 switch (adapter->link_speed) {
1083                 case SPEED_10:
1084                         adjust = IGB_I210_RX_LATENCY_10;
1085                         break;
1086                 case SPEED_100:
1087                         adjust = IGB_I210_RX_LATENCY_100;
1088                         break;
1089                 case SPEED_1000:
1090                         adjust = IGB_I210_RX_LATENCY_1000;
1091                         break;
1092                 }
1093         }
1094         skb_hwtstamps(skb)->hwtstamp =
1095                 ktime_sub_ns(skb_hwtstamps(skb)->hwtstamp, adjust);
1096
1097         /* Update the last_rx_timestamp timer in order to enable watchdog check
1098          * for error case of latched timestamp on a dropped packet.
1099          */
1100         adapter->last_rx_timestamp = jiffies;
1101 }
1102
1103 /**
1104  * igb_ptp_get_ts_config - get hardware time stamping config
1105  * @netdev: netdev struct
1106  * @ifr: interface struct
1107  *
1108  * Get the hwtstamp_config settings to return to the user. Rather than attempt
1109  * to deconstruct the settings from the registers, just return a shadow copy
1110  * of the last known settings.
1111  **/
1112 int igb_ptp_get_ts_config(struct net_device *netdev, struct ifreq *ifr)
1113 {
1114         struct igb_adapter *adapter = netdev_priv(netdev);
1115         struct hwtstamp_config *config = &adapter->tstamp_config;
1116
1117         return copy_to_user(ifr->ifr_data, config, sizeof(*config)) ?
1118                 -EFAULT : 0;
1119 }
1120
1121 /**
1122  * igb_ptp_set_timestamp_mode - setup hardware for timestamping
1123  * @adapter: networking device structure
1124  * @config: hwtstamp configuration
1125  *
1126  * Outgoing time stamping can be enabled and disabled. Play nice and
1127  * disable it when requested, although it shouldn't case any overhead
1128  * when no packet needs it. At most one packet in the queue may be
1129  * marked for time stamping, otherwise it would be impossible to tell
1130  * for sure to which packet the hardware time stamp belongs.
1131  *
1132  * Incoming time stamping has to be configured via the hardware
1133  * filters. Not all combinations are supported, in particular event
1134  * type has to be specified. Matching the kind of event packet is
1135  * not supported, with the exception of "all V2 events regardless of
1136  * level 2 or 4".
1137  */
1138 static int igb_ptp_set_timestamp_mode(struct igb_adapter *adapter,
1139                                       struct hwtstamp_config *config)
1140 {
1141         struct e1000_hw *hw = &adapter->hw;
1142         u32 tsync_tx_ctl = E1000_TSYNCTXCTL_ENABLED;
1143         u32 tsync_rx_ctl = E1000_TSYNCRXCTL_ENABLED;
1144         u32 tsync_rx_cfg = 0;
1145         bool is_l4 = false;
1146         bool is_l2 = false;
1147         u32 regval;
1148
1149         switch (config->tx_type) {
1150         case HWTSTAMP_TX_OFF:
1151                 tsync_tx_ctl = 0;
1152                 break;
1153         case HWTSTAMP_TX_ON:
1154                 break;
1155         default:
1156                 return -ERANGE;
1157         }
1158
1159         switch (config->rx_filter) {
1160         case HWTSTAMP_FILTER_NONE:
1161                 tsync_rx_ctl = 0;
1162                 break;
1163         case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1164                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L4_V1;
1165                 tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V1_SYNC_MESSAGE;
1166                 is_l4 = true;
1167                 break;
1168         case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1169                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L4_V1;
1170                 tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V1_DELAY_REQ_MESSAGE;
1171                 is_l4 = true;
1172                 break;
1173         case HWTSTAMP_FILTER_PTP_V2_EVENT:
1174         case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1175         case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1176         case HWTSTAMP_FILTER_PTP_V2_SYNC:
1177         case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1178         case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1179         case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1180         case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1181         case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1182                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_EVENT_V2;
1183                 config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
1184                 is_l2 = true;
1185                 is_l4 = true;
1186                 break;
1187         case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1188         case HWTSTAMP_FILTER_NTP_ALL:
1189         case HWTSTAMP_FILTER_ALL:
1190                 /* 82576 cannot timestamp all packets, which it needs to do to
1191                  * support both V1 Sync and Delay_Req messages
1192                  */
1193                 if (hw->mac.type != e1000_82576) {
1194                         tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_ALL;
1195                         config->rx_filter = HWTSTAMP_FILTER_ALL;
1196                         break;
1197                 }
1198                 fallthrough;
1199         default:
1200                 config->rx_filter = HWTSTAMP_FILTER_NONE;
1201                 return -ERANGE;
1202         }
1203
1204         if (hw->mac.type == e1000_82575) {
1205                 if (tsync_rx_ctl | tsync_tx_ctl)
1206                         return -EINVAL;
1207                 return 0;
1208         }
1209
1210         /* Per-packet timestamping only works if all packets are
1211          * timestamped, so enable timestamping in all packets as
1212          * long as one Rx filter was configured.
1213          */
1214         if ((hw->mac.type >= e1000_82580) && tsync_rx_ctl) {
1215                 tsync_rx_ctl = E1000_TSYNCRXCTL_ENABLED;
1216                 tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_ALL;
1217                 config->rx_filter = HWTSTAMP_FILTER_ALL;
1218                 is_l2 = true;
1219                 is_l4 = true;
1220
1221                 if ((hw->mac.type == e1000_i210) ||
1222                     (hw->mac.type == e1000_i211)) {
1223                         regval = rd32(E1000_RXPBS);
1224                         regval |= E1000_RXPBS_CFG_TS_EN;
1225                         wr32(E1000_RXPBS, regval);
1226                 }
1227         }
1228
1229         /* enable/disable TX */
1230         regval = rd32(E1000_TSYNCTXCTL);
1231         regval &= ~E1000_TSYNCTXCTL_ENABLED;
1232         regval |= tsync_tx_ctl;
1233         wr32(E1000_TSYNCTXCTL, regval);
1234
1235         /* enable/disable RX */
1236         regval = rd32(E1000_TSYNCRXCTL);
1237         regval &= ~(E1000_TSYNCRXCTL_ENABLED | E1000_TSYNCRXCTL_TYPE_MASK);
1238         regval |= tsync_rx_ctl;
1239         wr32(E1000_TSYNCRXCTL, regval);
1240
1241         /* define which PTP packets are time stamped */
1242         wr32(E1000_TSYNCRXCFG, tsync_rx_cfg);
1243
1244         /* define ethertype filter for timestamped packets */
1245         if (is_l2)
1246                 wr32(E1000_ETQF(IGB_ETQF_FILTER_1588),
1247                      (E1000_ETQF_FILTER_ENABLE | /* enable filter */
1248                       E1000_ETQF_1588 | /* enable timestamping */
1249                       ETH_P_1588));     /* 1588 eth protocol type */
1250         else
1251                 wr32(E1000_ETQF(IGB_ETQF_FILTER_1588), 0);
1252
1253         /* L4 Queue Filter[3]: filter by destination port and protocol */
1254         if (is_l4) {
1255                 u32 ftqf = (IPPROTO_UDP /* UDP */
1256                         | E1000_FTQF_VF_BP /* VF not compared */
1257                         | E1000_FTQF_1588_TIME_STAMP /* Enable Timestamping */
1258                         | E1000_FTQF_MASK); /* mask all inputs */
1259                 ftqf &= ~E1000_FTQF_MASK_PROTO_BP; /* enable protocol check */
1260
1261                 wr32(E1000_IMIR(3), (__force unsigned int)htons(PTP_EV_PORT));
1262                 wr32(E1000_IMIREXT(3),
1263                      (E1000_IMIREXT_SIZE_BP | E1000_IMIREXT_CTRL_BP));
1264                 if (hw->mac.type == e1000_82576) {
1265                         /* enable source port check */
1266                         wr32(E1000_SPQF(3), (__force unsigned int)htons(PTP_EV_PORT));
1267                         ftqf &= ~E1000_FTQF_MASK_SOURCE_PORT_BP;
1268                 }
1269                 wr32(E1000_FTQF(3), ftqf);
1270         } else {
1271                 wr32(E1000_FTQF(3), E1000_FTQF_MASK);
1272         }
1273         wrfl();
1274
1275         /* clear TX/RX time stamp registers, just to be sure */
1276         regval = rd32(E1000_TXSTMPL);
1277         regval = rd32(E1000_TXSTMPH);
1278         regval = rd32(E1000_RXSTMPL);
1279         regval = rd32(E1000_RXSTMPH);
1280
1281         return 0;
1282 }
1283
1284 /**
1285  * igb_ptp_set_ts_config - set hardware time stamping config
1286  * @netdev: netdev struct
1287  * @ifr: interface struct
1288  *
1289  **/
1290 int igb_ptp_set_ts_config(struct net_device *netdev, struct ifreq *ifr)
1291 {
1292         struct igb_adapter *adapter = netdev_priv(netdev);
1293         struct hwtstamp_config config;
1294         int err;
1295
1296         if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
1297                 return -EFAULT;
1298
1299         err = igb_ptp_set_timestamp_mode(adapter, &config);
1300         if (err)
1301                 return err;
1302
1303         /* save these settings for future reference */
1304         memcpy(&adapter->tstamp_config, &config,
1305                sizeof(adapter->tstamp_config));
1306
1307         return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
1308                 -EFAULT : 0;
1309 }
1310
1311 /**
1312  * igb_ptp_init - Initialize PTP functionality
1313  * @adapter: Board private structure
1314  *
1315  * This function is called at device probe to initialize the PTP
1316  * functionality.
1317  */
1318 void igb_ptp_init(struct igb_adapter *adapter)
1319 {
1320         struct e1000_hw *hw = &adapter->hw;
1321         struct net_device *netdev = adapter->netdev;
1322
1323         switch (hw->mac.type) {
1324         case e1000_82576:
1325                 snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
1326                 adapter->ptp_caps.owner = THIS_MODULE;
1327                 adapter->ptp_caps.max_adj = 999999881;
1328                 adapter->ptp_caps.n_ext_ts = 0;
1329                 adapter->ptp_caps.pps = 0;
1330                 adapter->ptp_caps.adjfine = igb_ptp_adjfine_82576;
1331                 adapter->ptp_caps.adjtime = igb_ptp_adjtime_82576;
1332                 adapter->ptp_caps.gettimex64 = igb_ptp_gettimex_82576;
1333                 adapter->ptp_caps.settime64 = igb_ptp_settime_82576;
1334                 adapter->ptp_caps.enable = igb_ptp_feature_enable;
1335                 adapter->cc.read = igb_ptp_read_82576;
1336                 adapter->cc.mask = CYCLECOUNTER_MASK(64);
1337                 adapter->cc.mult = 1;
1338                 adapter->cc.shift = IGB_82576_TSYNC_SHIFT;
1339                 adapter->ptp_flags |= IGB_PTP_OVERFLOW_CHECK;
1340                 break;
1341         case e1000_82580:
1342         case e1000_i354:
1343         case e1000_i350:
1344                 igb_ptp_sdp_init(adapter);
1345                 snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
1346                 adapter->ptp_caps.owner = THIS_MODULE;
1347                 adapter->ptp_caps.max_adj = 62499999;
1348                 adapter->ptp_caps.n_ext_ts = IGB_N_EXTTS;
1349                 adapter->ptp_caps.n_per_out = IGB_N_PEROUT;
1350                 adapter->ptp_caps.n_pins = IGB_N_SDP;
1351                 adapter->ptp_caps.pps = 0;
1352                 adapter->ptp_caps.pin_config = adapter->sdp_config;
1353                 adapter->ptp_caps.adjfine = igb_ptp_adjfine_82580;
1354                 adapter->ptp_caps.adjtime = igb_ptp_adjtime_82576;
1355                 adapter->ptp_caps.gettimex64 = igb_ptp_gettimex_82580;
1356                 adapter->ptp_caps.settime64 = igb_ptp_settime_82576;
1357                 adapter->ptp_caps.enable = igb_ptp_feature_enable_82580;
1358                 adapter->ptp_caps.verify = igb_ptp_verify_pin;
1359                 adapter->cc.read = igb_ptp_read_82580;
1360                 adapter->cc.mask = CYCLECOUNTER_MASK(IGB_NBITS_82580);
1361                 adapter->cc.mult = 1;
1362                 adapter->cc.shift = 0;
1363                 adapter->ptp_flags |= IGB_PTP_OVERFLOW_CHECK;
1364                 break;
1365         case e1000_i210:
1366         case e1000_i211:
1367                 igb_ptp_sdp_init(adapter);
1368                 snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
1369                 adapter->ptp_caps.owner = THIS_MODULE;
1370                 adapter->ptp_caps.max_adj = 62499999;
1371                 adapter->ptp_caps.n_ext_ts = IGB_N_EXTTS;
1372                 adapter->ptp_caps.n_per_out = IGB_N_PEROUT;
1373                 adapter->ptp_caps.n_pins = IGB_N_SDP;
1374                 adapter->ptp_caps.pps = 1;
1375                 adapter->ptp_caps.pin_config = adapter->sdp_config;
1376                 adapter->ptp_caps.adjfine = igb_ptp_adjfine_82580;
1377                 adapter->ptp_caps.adjtime = igb_ptp_adjtime_i210;
1378                 adapter->ptp_caps.gettimex64 = igb_ptp_gettimex_i210;
1379                 adapter->ptp_caps.settime64 = igb_ptp_settime_i210;
1380                 adapter->ptp_caps.enable = igb_ptp_feature_enable_i210;
1381                 adapter->ptp_caps.verify = igb_ptp_verify_pin;
1382                 break;
1383         default:
1384                 adapter->ptp_clock = NULL;
1385                 return;
1386         }
1387
1388         adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps,
1389                                                 &adapter->pdev->dev);
1390         if (IS_ERR(adapter->ptp_clock)) {
1391                 adapter->ptp_clock = NULL;
1392                 dev_err(&adapter->pdev->dev, "ptp_clock_register failed\n");
1393         } else if (adapter->ptp_clock) {
1394                 dev_info(&adapter->pdev->dev, "added PHC on %s\n",
1395                          adapter->netdev->name);
1396                 adapter->ptp_flags |= IGB_PTP_ENABLED;
1397
1398                 spin_lock_init(&adapter->tmreg_lock);
1399                 INIT_WORK(&adapter->ptp_tx_work, igb_ptp_tx_work);
1400
1401                 if (adapter->ptp_flags & IGB_PTP_OVERFLOW_CHECK)
1402                         INIT_DELAYED_WORK(&adapter->ptp_overflow_work,
1403                                           igb_ptp_overflow_check);
1404
1405                 adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
1406                 adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
1407
1408                 igb_ptp_reset(adapter);
1409         }
1410 }
1411
1412 /**
1413  * igb_ptp_sdp_init - utility function which inits the SDP config structs
1414  * @adapter: Board private structure.
1415  **/
1416 void igb_ptp_sdp_init(struct igb_adapter *adapter)
1417 {
1418         int i;
1419
1420         for (i = 0; i < IGB_N_SDP; i++) {
1421                 struct ptp_pin_desc *ppd = &adapter->sdp_config[i];
1422
1423                 snprintf(ppd->name, sizeof(ppd->name), "SDP%d", i);
1424                 ppd->index = i;
1425                 ppd->func = PTP_PF_NONE;
1426         }
1427 }
1428
1429 /**
1430  * igb_ptp_suspend - Disable PTP work items and prepare for suspend
1431  * @adapter: Board private structure
1432  *
1433  * This function stops the overflow check work and PTP Tx timestamp work, and
1434  * will prepare the device for OS suspend.
1435  */
1436 void igb_ptp_suspend(struct igb_adapter *adapter)
1437 {
1438         if (!(adapter->ptp_flags & IGB_PTP_ENABLED))
1439                 return;
1440
1441         if (adapter->ptp_flags & IGB_PTP_OVERFLOW_CHECK)
1442                 cancel_delayed_work_sync(&adapter->ptp_overflow_work);
1443
1444         cancel_work_sync(&adapter->ptp_tx_work);
1445         if (adapter->ptp_tx_skb) {
1446                 dev_kfree_skb_any(adapter->ptp_tx_skb);
1447                 adapter->ptp_tx_skb = NULL;
1448                 clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
1449         }
1450 }
1451
1452 /**
1453  * igb_ptp_stop - Disable PTP device and stop the overflow check.
1454  * @adapter: Board private structure.
1455  *
1456  * This function stops the PTP support and cancels the delayed work.
1457  **/
1458 void igb_ptp_stop(struct igb_adapter *adapter)
1459 {
1460         igb_ptp_suspend(adapter);
1461
1462         if (adapter->ptp_clock) {
1463                 ptp_clock_unregister(adapter->ptp_clock);
1464                 dev_info(&adapter->pdev->dev, "removed PHC on %s\n",
1465                          adapter->netdev->name);
1466                 adapter->ptp_flags &= ~IGB_PTP_ENABLED;
1467         }
1468 }
1469
1470 /**
1471  * igb_ptp_reset - Re-enable the adapter for PTP following a reset.
1472  * @adapter: Board private structure.
1473  *
1474  * This function handles the reset work required to re-enable the PTP device.
1475  **/
1476 void igb_ptp_reset(struct igb_adapter *adapter)
1477 {
1478         struct e1000_hw *hw = &adapter->hw;
1479         unsigned long flags;
1480
1481         /* reset the tstamp_config */
1482         igb_ptp_set_timestamp_mode(adapter, &adapter->tstamp_config);
1483
1484         spin_lock_irqsave(&adapter->tmreg_lock, flags);
1485
1486         switch (adapter->hw.mac.type) {
1487         case e1000_82576:
1488                 /* Dial the nominal frequency. */
1489                 wr32(E1000_TIMINCA, INCPERIOD_82576 | INCVALUE_82576);
1490                 break;
1491         case e1000_82580:
1492         case e1000_i354:
1493         case e1000_i350:
1494         case e1000_i210:
1495         case e1000_i211:
1496                 wr32(E1000_TSAUXC, 0x0);
1497                 wr32(E1000_TSSDP, 0x0);
1498                 wr32(E1000_TSIM,
1499                      TSYNC_INTERRUPTS |
1500                      (adapter->pps_sys_wrap_on ? TSINTR_SYS_WRAP : 0));
1501                 wr32(E1000_IMS, E1000_IMS_TS);
1502                 break;
1503         default:
1504                 /* No work to do. */
1505                 goto out;
1506         }
1507
1508         /* Re-initialize the timer. */
1509         if ((hw->mac.type == e1000_i210) || (hw->mac.type == e1000_i211)) {
1510                 struct timespec64 ts = ktime_to_timespec64(ktime_get_real());
1511
1512                 igb_ptp_write_i210(adapter, &ts);
1513         } else {
1514                 timecounter_init(&adapter->tc, &adapter->cc,
1515                                  ktime_to_ns(ktime_get_real()));
1516         }
1517 out:
1518         spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
1519
1520         wrfl();
1521
1522         if (adapter->ptp_flags & IGB_PTP_OVERFLOW_CHECK)
1523                 schedule_delayed_work(&adapter->ptp_overflow_work,
1524                                       IGB_SYSTIM_OVERFLOW_PERIOD);
1525 }