1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2019 Intel Corporation */ 3 4 #include "igc.h" 5 6 #include <linux/module.h> 7 #include <linux/device.h> 8 #include <linux/pci.h> 9 #include <linux/ptp_classify.h> 10 #include <linux/clocksource.h> 11 #include <linux/ktime.h> 12 #include <linux/delay.h> 13 #include <linux/iopoll.h> 14 #include <net/xdp_sock_drv.h> 15 16 #define INCVALUE_MASK 0x7fffffff 17 #define ISGN 0x80000000 18 19 #define IGC_PTP_TX_TIMEOUT (HZ * 15) 20 21 #define IGC_PTM_STAT_SLEEP 2 22 #define IGC_PTM_STAT_TIMEOUT 100 23 24 /* SYSTIM read access for I225 */ 25 void igc_ptp_read(struct igc_adapter *adapter, struct timespec64 *ts) 26 { 27 struct igc_hw *hw = &adapter->hw; 28 u32 sec, nsec; 29 30 /* The timestamp is latched when SYSTIML is read. */ 31 nsec = rd32(IGC_SYSTIML); 32 sec = rd32(IGC_SYSTIMH); 33 34 ts->tv_sec = sec; 35 ts->tv_nsec = nsec; 36 } 37 38 static void igc_ptp_write_i225(struct igc_adapter *adapter, 39 const struct timespec64 *ts) 40 { 41 struct igc_hw *hw = &adapter->hw; 42 43 wr32(IGC_SYSTIML, ts->tv_nsec); 44 wr32(IGC_SYSTIMH, ts->tv_sec); 45 } 46 47 static int igc_ptp_adjfine_i225(struct ptp_clock_info *ptp, long scaled_ppm) 48 { 49 struct igc_adapter *igc = container_of(ptp, struct igc_adapter, 50 ptp_caps); 51 struct igc_hw *hw = &igc->hw; 52 int neg_adj = 0; 53 u64 rate; 54 u32 inca; 55 56 if (scaled_ppm < 0) { 57 neg_adj = 1; 58 scaled_ppm = -scaled_ppm; 59 } 60 rate = scaled_ppm; 61 rate <<= 14; 62 rate = div_u64(rate, 78125); 63 64 inca = rate & INCVALUE_MASK; 65 if (neg_adj) 66 inca |= ISGN; 67 68 wr32(IGC_TIMINCA, inca); 69 70 return 0; 71 } 72 73 static int igc_ptp_adjtime_i225(struct ptp_clock_info *ptp, s64 delta) 74 { 75 struct igc_adapter *igc = container_of(ptp, struct igc_adapter, 76 ptp_caps); 77 struct timespec64 now, then = ns_to_timespec64(delta); 78 unsigned long flags; 79 80 spin_lock_irqsave(&igc->tmreg_lock, flags); 81 82 igc_ptp_read(igc, &now); 83 now = timespec64_add(now, then); 84 igc_ptp_write_i225(igc, (const struct timespec64 *)&now); 85 86 spin_unlock_irqrestore(&igc->tmreg_lock, flags); 87 88 return 0; 89 } 90 91 static int igc_ptp_gettimex64_i225(struct ptp_clock_info *ptp, 92 struct timespec64 *ts, 93 struct ptp_system_timestamp *sts) 94 { 95 struct igc_adapter *igc = container_of(ptp, struct igc_adapter, 96 ptp_caps); 97 struct igc_hw *hw = &igc->hw; 98 unsigned long flags; 99 100 spin_lock_irqsave(&igc->tmreg_lock, flags); 101 102 ptp_read_system_prets(sts); 103 ts->tv_nsec = rd32(IGC_SYSTIML); 104 ts->tv_sec = rd32(IGC_SYSTIMH); 105 ptp_read_system_postts(sts); 106 107 spin_unlock_irqrestore(&igc->tmreg_lock, flags); 108 109 return 0; 110 } 111 112 static int igc_ptp_settime_i225(struct ptp_clock_info *ptp, 113 const struct timespec64 *ts) 114 { 115 struct igc_adapter *igc = container_of(ptp, struct igc_adapter, 116 ptp_caps); 117 unsigned long flags; 118 119 spin_lock_irqsave(&igc->tmreg_lock, flags); 120 121 igc_ptp_write_i225(igc, ts); 122 123 spin_unlock_irqrestore(&igc->tmreg_lock, flags); 124 125 return 0; 126 } 127 128 static void igc_pin_direction(int pin, int input, u32 *ctrl, u32 *ctrl_ext) 129 { 130 u32 *ptr = pin < 2 ? ctrl : ctrl_ext; 131 static const u32 mask[IGC_N_SDP] = { 132 IGC_CTRL_SDP0_DIR, 133 IGC_CTRL_SDP1_DIR, 134 IGC_CTRL_EXT_SDP2_DIR, 135 IGC_CTRL_EXT_SDP3_DIR, 136 }; 137 138 if (input) 139 *ptr &= ~mask[pin]; 140 else 141 *ptr |= mask[pin]; 142 } 143 144 static void igc_pin_perout(struct igc_adapter *igc, int chan, int pin, int freq) 145 { 146 static const u32 igc_aux0_sel_sdp[IGC_N_SDP] = { 147 IGC_AUX0_SEL_SDP0, IGC_AUX0_SEL_SDP1, IGC_AUX0_SEL_SDP2, IGC_AUX0_SEL_SDP3, 148 }; 149 static const u32 igc_aux1_sel_sdp[IGC_N_SDP] = { 150 IGC_AUX1_SEL_SDP0, IGC_AUX1_SEL_SDP1, IGC_AUX1_SEL_SDP2, IGC_AUX1_SEL_SDP3, 151 }; 152 static const u32 igc_ts_sdp_en[IGC_N_SDP] = { 153 IGC_TS_SDP0_EN, IGC_TS_SDP1_EN, IGC_TS_SDP2_EN, IGC_TS_SDP3_EN, 154 }; 155 static const u32 igc_ts_sdp_sel_tt0[IGC_N_SDP] = { 156 IGC_TS_SDP0_SEL_TT0, IGC_TS_SDP1_SEL_TT0, 157 IGC_TS_SDP2_SEL_TT0, IGC_TS_SDP3_SEL_TT0, 158 }; 159 static const u32 igc_ts_sdp_sel_tt1[IGC_N_SDP] = { 160 IGC_TS_SDP0_SEL_TT1, IGC_TS_SDP1_SEL_TT1, 161 IGC_TS_SDP2_SEL_TT1, IGC_TS_SDP3_SEL_TT1, 162 }; 163 static const u32 igc_ts_sdp_sel_fc0[IGC_N_SDP] = { 164 IGC_TS_SDP0_SEL_FC0, IGC_TS_SDP1_SEL_FC0, 165 IGC_TS_SDP2_SEL_FC0, IGC_TS_SDP3_SEL_FC0, 166 }; 167 static const u32 igc_ts_sdp_sel_fc1[IGC_N_SDP] = { 168 IGC_TS_SDP0_SEL_FC1, IGC_TS_SDP1_SEL_FC1, 169 IGC_TS_SDP2_SEL_FC1, IGC_TS_SDP3_SEL_FC1, 170 }; 171 static const u32 igc_ts_sdp_sel_clr[IGC_N_SDP] = { 172 IGC_TS_SDP0_SEL_FC1, IGC_TS_SDP1_SEL_FC1, 173 IGC_TS_SDP2_SEL_FC1, IGC_TS_SDP3_SEL_FC1, 174 }; 175 struct igc_hw *hw = &igc->hw; 176 u32 ctrl, ctrl_ext, tssdp = 0; 177 178 ctrl = rd32(IGC_CTRL); 179 ctrl_ext = rd32(IGC_CTRL_EXT); 180 tssdp = rd32(IGC_TSSDP); 181 182 igc_pin_direction(pin, 0, &ctrl, &ctrl_ext); 183 184 /* Make sure this pin is not enabled as an input. */ 185 if ((tssdp & IGC_AUX0_SEL_SDP3) == igc_aux0_sel_sdp[pin]) 186 tssdp &= ~IGC_AUX0_TS_SDP_EN; 187 188 if ((tssdp & IGC_AUX1_SEL_SDP3) == igc_aux1_sel_sdp[pin]) 189 tssdp &= ~IGC_AUX1_TS_SDP_EN; 190 191 tssdp &= ~igc_ts_sdp_sel_clr[pin]; 192 if (freq) { 193 if (chan == 1) 194 tssdp |= igc_ts_sdp_sel_fc1[pin]; 195 else 196 tssdp |= igc_ts_sdp_sel_fc0[pin]; 197 } else { 198 if (chan == 1) 199 tssdp |= igc_ts_sdp_sel_tt1[pin]; 200 else 201 tssdp |= igc_ts_sdp_sel_tt0[pin]; 202 } 203 tssdp |= igc_ts_sdp_en[pin]; 204 205 wr32(IGC_TSSDP, tssdp); 206 wr32(IGC_CTRL, ctrl); 207 wr32(IGC_CTRL_EXT, ctrl_ext); 208 } 209 210 static void igc_pin_extts(struct igc_adapter *igc, int chan, int pin) 211 { 212 static const u32 igc_aux0_sel_sdp[IGC_N_SDP] = { 213 IGC_AUX0_SEL_SDP0, IGC_AUX0_SEL_SDP1, IGC_AUX0_SEL_SDP2, IGC_AUX0_SEL_SDP3, 214 }; 215 static const u32 igc_aux1_sel_sdp[IGC_N_SDP] = { 216 IGC_AUX1_SEL_SDP0, IGC_AUX1_SEL_SDP1, IGC_AUX1_SEL_SDP2, IGC_AUX1_SEL_SDP3, 217 }; 218 static const u32 igc_ts_sdp_en[IGC_N_SDP] = { 219 IGC_TS_SDP0_EN, IGC_TS_SDP1_EN, IGC_TS_SDP2_EN, IGC_TS_SDP3_EN, 220 }; 221 struct igc_hw *hw = &igc->hw; 222 u32 ctrl, ctrl_ext, tssdp = 0; 223 224 ctrl = rd32(IGC_CTRL); 225 ctrl_ext = rd32(IGC_CTRL_EXT); 226 tssdp = rd32(IGC_TSSDP); 227 228 igc_pin_direction(pin, 1, &ctrl, &ctrl_ext); 229 230 /* Make sure this pin is not enabled as an output. */ 231 tssdp &= ~igc_ts_sdp_en[pin]; 232 233 if (chan == 1) { 234 tssdp &= ~IGC_AUX1_SEL_SDP3; 235 tssdp |= igc_aux1_sel_sdp[pin] | IGC_AUX1_TS_SDP_EN; 236 } else { 237 tssdp &= ~IGC_AUX0_SEL_SDP3; 238 tssdp |= igc_aux0_sel_sdp[pin] | IGC_AUX0_TS_SDP_EN; 239 } 240 241 wr32(IGC_TSSDP, tssdp); 242 wr32(IGC_CTRL, ctrl); 243 wr32(IGC_CTRL_EXT, ctrl_ext); 244 } 245 246 static int igc_ptp_feature_enable_i225(struct ptp_clock_info *ptp, 247 struct ptp_clock_request *rq, int on) 248 { 249 struct igc_adapter *igc = 250 container_of(ptp, struct igc_adapter, ptp_caps); 251 struct igc_hw *hw = &igc->hw; 252 unsigned long flags; 253 struct timespec64 ts; 254 int use_freq = 0, pin = -1; 255 u32 tsim, tsauxc, tsauxc_mask, tsim_mask, trgttiml, trgttimh, freqout; 256 s64 ns; 257 258 switch (rq->type) { 259 case PTP_CLK_REQ_EXTTS: 260 /* Reject requests failing to enable both edges. */ 261 if ((rq->extts.flags & PTP_STRICT_FLAGS) && 262 (rq->extts.flags & PTP_ENABLE_FEATURE) && 263 (rq->extts.flags & PTP_EXTTS_EDGES) != PTP_EXTTS_EDGES) 264 return -EOPNOTSUPP; 265 266 if (on) { 267 pin = ptp_find_pin(igc->ptp_clock, PTP_PF_EXTTS, 268 rq->extts.index); 269 if (pin < 0) 270 return -EBUSY; 271 } 272 if (rq->extts.index == 1) { 273 tsauxc_mask = IGC_TSAUXC_EN_TS1; 274 tsim_mask = IGC_TSICR_AUTT1; 275 } else { 276 tsauxc_mask = IGC_TSAUXC_EN_TS0; 277 tsim_mask = IGC_TSICR_AUTT0; 278 } 279 spin_lock_irqsave(&igc->tmreg_lock, flags); 280 tsauxc = rd32(IGC_TSAUXC); 281 tsim = rd32(IGC_TSIM); 282 if (on) { 283 igc_pin_extts(igc, rq->extts.index, pin); 284 tsauxc |= tsauxc_mask; 285 tsim |= tsim_mask; 286 } else { 287 tsauxc &= ~tsauxc_mask; 288 tsim &= ~tsim_mask; 289 } 290 wr32(IGC_TSAUXC, tsauxc); 291 wr32(IGC_TSIM, tsim); 292 spin_unlock_irqrestore(&igc->tmreg_lock, flags); 293 return 0; 294 295 case PTP_CLK_REQ_PEROUT: 296 if (on) { 297 pin = ptp_find_pin(igc->ptp_clock, PTP_PF_PEROUT, 298 rq->perout.index); 299 if (pin < 0) 300 return -EBUSY; 301 } 302 ts.tv_sec = rq->perout.period.sec; 303 ts.tv_nsec = rq->perout.period.nsec; 304 ns = timespec64_to_ns(&ts); 305 ns = ns >> 1; 306 if (on && (ns <= 70000000LL || ns == 125000000LL || 307 ns == 250000000LL || ns == 500000000LL)) { 308 if (ns < 8LL) 309 return -EINVAL; 310 use_freq = 1; 311 } 312 ts = ns_to_timespec64(ns); 313 if (rq->perout.index == 1) { 314 if (use_freq) { 315 tsauxc_mask = IGC_TSAUXC_EN_CLK1 | IGC_TSAUXC_ST1; 316 tsim_mask = 0; 317 } else { 318 tsauxc_mask = IGC_TSAUXC_EN_TT1; 319 tsim_mask = IGC_TSICR_TT1; 320 } 321 trgttiml = IGC_TRGTTIML1; 322 trgttimh = IGC_TRGTTIMH1; 323 freqout = IGC_FREQOUT1; 324 } else { 325 if (use_freq) { 326 tsauxc_mask = IGC_TSAUXC_EN_CLK0 | IGC_TSAUXC_ST0; 327 tsim_mask = 0; 328 } else { 329 tsauxc_mask = IGC_TSAUXC_EN_TT0; 330 tsim_mask = IGC_TSICR_TT0; 331 } 332 trgttiml = IGC_TRGTTIML0; 333 trgttimh = IGC_TRGTTIMH0; 334 freqout = IGC_FREQOUT0; 335 } 336 spin_lock_irqsave(&igc->tmreg_lock, flags); 337 tsauxc = rd32(IGC_TSAUXC); 338 tsim = rd32(IGC_TSIM); 339 if (rq->perout.index == 1) { 340 tsauxc &= ~(IGC_TSAUXC_EN_TT1 | IGC_TSAUXC_EN_CLK1 | 341 IGC_TSAUXC_ST1); 342 tsim &= ~IGC_TSICR_TT1; 343 } else { 344 tsauxc &= ~(IGC_TSAUXC_EN_TT0 | IGC_TSAUXC_EN_CLK0 | 345 IGC_TSAUXC_ST0); 346 tsim &= ~IGC_TSICR_TT0; 347 } 348 if (on) { 349 struct timespec64 safe_start; 350 int i = rq->perout.index; 351 352 igc_pin_perout(igc, i, pin, use_freq); 353 igc_ptp_read(igc, &safe_start); 354 355 /* PPS output start time is triggered by Target time(TT) 356 * register. Programming any past time value into TT 357 * register will cause PPS to never start. Need to make 358 * sure we program the TT register a time ahead in 359 * future. There isn't a stringent need to fire PPS out 360 * right away. Adding +2 seconds should take care of 361 * corner cases. Let's say if the SYSTIML is close to 362 * wrap up and the timer keeps ticking as we program the 363 * register, adding +2seconds is safe bet. 364 */ 365 safe_start.tv_sec += 2; 366 367 if (rq->perout.start.sec < safe_start.tv_sec) 368 igc->perout[i].start.tv_sec = safe_start.tv_sec; 369 else 370 igc->perout[i].start.tv_sec = rq->perout.start.sec; 371 igc->perout[i].start.tv_nsec = rq->perout.start.nsec; 372 igc->perout[i].period.tv_sec = ts.tv_sec; 373 igc->perout[i].period.tv_nsec = ts.tv_nsec; 374 wr32(trgttimh, (u32)igc->perout[i].start.tv_sec); 375 /* For now, always select timer 0 as source. */ 376 wr32(trgttiml, (u32)(igc->perout[i].start.tv_nsec | 377 IGC_TT_IO_TIMER_SEL_SYSTIM0)); 378 if (use_freq) 379 wr32(freqout, ns); 380 tsauxc |= tsauxc_mask; 381 tsim |= tsim_mask; 382 } 383 wr32(IGC_TSAUXC, tsauxc); 384 wr32(IGC_TSIM, tsim); 385 spin_unlock_irqrestore(&igc->tmreg_lock, flags); 386 return 0; 387 388 case PTP_CLK_REQ_PPS: 389 spin_lock_irqsave(&igc->tmreg_lock, flags); 390 tsim = rd32(IGC_TSIM); 391 if (on) 392 tsim |= IGC_TSICR_SYS_WRAP; 393 else 394 tsim &= ~IGC_TSICR_SYS_WRAP; 395 igc->pps_sys_wrap_on = on; 396 wr32(IGC_TSIM, tsim); 397 spin_unlock_irqrestore(&igc->tmreg_lock, flags); 398 return 0; 399 400 default: 401 break; 402 } 403 404 return -EOPNOTSUPP; 405 } 406 407 static int igc_ptp_verify_pin(struct ptp_clock_info *ptp, unsigned int pin, 408 enum ptp_pin_function func, unsigned int chan) 409 { 410 switch (func) { 411 case PTP_PF_NONE: 412 case PTP_PF_EXTTS: 413 case PTP_PF_PEROUT: 414 break; 415 case PTP_PF_PHYSYNC: 416 return -1; 417 } 418 return 0; 419 } 420 421 /** 422 * igc_ptp_systim_to_hwtstamp - convert system time value to HW timestamp 423 * @adapter: board private structure 424 * @hwtstamps: timestamp structure to update 425 * @systim: unsigned 64bit system time value 426 * 427 * We need to convert the system time value stored in the RX/TXSTMP registers 428 * into a hwtstamp which can be used by the upper level timestamping functions. 429 * 430 * Returns 0 on success. 431 **/ 432 static int igc_ptp_systim_to_hwtstamp(struct igc_adapter *adapter, 433 struct skb_shared_hwtstamps *hwtstamps, 434 u64 systim) 435 { 436 switch (adapter->hw.mac.type) { 437 case igc_i225: 438 memset(hwtstamps, 0, sizeof(*hwtstamps)); 439 /* Upper 32 bits contain s, lower 32 bits contain ns. */ 440 hwtstamps->hwtstamp = ktime_set(systim >> 32, 441 systim & 0xFFFFFFFF); 442 break; 443 default: 444 return -EINVAL; 445 } 446 return 0; 447 } 448 449 /** 450 * igc_ptp_rx_pktstamp - Retrieve timestamp from Rx packet buffer 451 * @adapter: Pointer to adapter the packet buffer belongs to 452 * @buf: Pointer to start of timestamp in HW format (2 32-bit words) 453 * 454 * This function retrieves and converts the timestamp stored at @buf 455 * to ktime_t, adjusting for hardware latencies. 456 * 457 * Returns timestamp value. 458 */ 459 ktime_t igc_ptp_rx_pktstamp(struct igc_adapter *adapter, __le32 *buf) 460 { 461 ktime_t timestamp; 462 u32 secs, nsecs; 463 int adjust; 464 465 nsecs = le32_to_cpu(buf[0]); 466 secs = le32_to_cpu(buf[1]); 467 468 timestamp = ktime_set(secs, nsecs); 469 470 /* Adjust timestamp for the RX latency based on link speed */ 471 switch (adapter->link_speed) { 472 case SPEED_10: 473 adjust = IGC_I225_RX_LATENCY_10; 474 break; 475 case SPEED_100: 476 adjust = IGC_I225_RX_LATENCY_100; 477 break; 478 case SPEED_1000: 479 adjust = IGC_I225_RX_LATENCY_1000; 480 break; 481 case SPEED_2500: 482 adjust = IGC_I225_RX_LATENCY_2500; 483 break; 484 default: 485 adjust = 0; 486 netdev_warn_once(adapter->netdev, "Imprecise timestamp\n"); 487 break; 488 } 489 490 return ktime_sub_ns(timestamp, adjust); 491 } 492 493 static void igc_ptp_disable_rx_timestamp(struct igc_adapter *adapter) 494 { 495 struct igc_hw *hw = &adapter->hw; 496 u32 val; 497 int i; 498 499 wr32(IGC_TSYNCRXCTL, 0); 500 501 for (i = 0; i < adapter->num_rx_queues; i++) { 502 val = rd32(IGC_SRRCTL(i)); 503 val &= ~IGC_SRRCTL_TIMESTAMP; 504 wr32(IGC_SRRCTL(i), val); 505 } 506 507 val = rd32(IGC_RXPBS); 508 val &= ~IGC_RXPBS_CFG_TS_EN; 509 wr32(IGC_RXPBS, val); 510 } 511 512 static void igc_ptp_enable_rx_timestamp(struct igc_adapter *adapter) 513 { 514 struct igc_hw *hw = &adapter->hw; 515 u32 val; 516 int i; 517 518 val = rd32(IGC_RXPBS); 519 val |= IGC_RXPBS_CFG_TS_EN; 520 wr32(IGC_RXPBS, val); 521 522 for (i = 0; i < adapter->num_rx_queues; i++) { 523 val = rd32(IGC_SRRCTL(i)); 524 /* Enable retrieving timestamps from timer 0, the 525 * "adjustable clock" and timer 1 the "free running 526 * clock". 527 */ 528 val |= IGC_SRRCTL_TIMER1SEL(1) | IGC_SRRCTL_TIMER0SEL(0) | 529 IGC_SRRCTL_TIMESTAMP; 530 wr32(IGC_SRRCTL(i), val); 531 } 532 533 val = IGC_TSYNCRXCTL_ENABLED | IGC_TSYNCRXCTL_TYPE_ALL | 534 IGC_TSYNCRXCTL_RXSYNSIG; 535 wr32(IGC_TSYNCRXCTL, val); 536 } 537 538 static void igc_ptp_free_tx_buffer(struct igc_adapter *adapter, 539 struct igc_tx_timestamp_request *tstamp) 540 { 541 if (tstamp->buffer_type == IGC_TX_BUFFER_TYPE_XSK) { 542 /* Release the transmit completion */ 543 tstamp->xsk_tx_buffer->xsk_pending_ts = false; 544 545 /* Note: tstamp->skb and tstamp->xsk_tx_buffer are in union. 546 * By setting tstamp->xsk_tx_buffer to NULL, tstamp->skb will 547 * become NULL as well. 548 */ 549 tstamp->xsk_tx_buffer = NULL; 550 tstamp->buffer_type = 0; 551 552 /* Trigger txrx interrupt for transmit completion */ 553 igc_xsk_wakeup(adapter->netdev, tstamp->xsk_queue_index, 0); 554 555 return; 556 } 557 558 dev_kfree_skb_any(tstamp->skb); 559 tstamp->skb = NULL; 560 } 561 562 static void igc_ptp_clear_tx_tstamp(struct igc_adapter *adapter) 563 { 564 unsigned long flags; 565 int i; 566 567 spin_lock_irqsave(&adapter->ptp_tx_lock, flags); 568 569 for (i = 0; i < IGC_MAX_TX_TSTAMP_REGS; i++) { 570 struct igc_tx_timestamp_request *tstamp = &adapter->tx_tstamp[i]; 571 572 if (tstamp->skb) 573 igc_ptp_free_tx_buffer(adapter, tstamp); 574 } 575 576 spin_unlock_irqrestore(&adapter->ptp_tx_lock, flags); 577 } 578 579 static void igc_ptp_disable_tx_timestamp(struct igc_adapter *adapter) 580 { 581 struct igc_hw *hw = &adapter->hw; 582 int i; 583 584 /* Clear the flags first to avoid new packets to be enqueued 585 * for TX timestamping. 586 */ 587 for (i = 0; i < adapter->num_tx_queues; i++) { 588 struct igc_ring *tx_ring = adapter->tx_ring[i]; 589 590 clear_bit(IGC_RING_FLAG_TX_HWTSTAMP, &tx_ring->flags); 591 } 592 593 /* Now we can clean the pending TX timestamp requests. */ 594 igc_ptp_clear_tx_tstamp(adapter); 595 596 wr32(IGC_TSYNCTXCTL, 0); 597 } 598 599 static void igc_ptp_enable_tx_timestamp(struct igc_adapter *adapter) 600 { 601 struct igc_hw *hw = &adapter->hw; 602 int i; 603 604 wr32(IGC_TSYNCTXCTL, IGC_TSYNCTXCTL_ENABLED | IGC_TSYNCTXCTL_TXSYNSIG); 605 606 /* Read TXSTMP registers to discard any timestamp previously stored. */ 607 rd32(IGC_TXSTMPL); 608 rd32(IGC_TXSTMPH); 609 610 /* The hardware is ready to accept TX timestamp requests, 611 * notify the transmit path. 612 */ 613 for (i = 0; i < adapter->num_tx_queues; i++) { 614 struct igc_ring *tx_ring = adapter->tx_ring[i]; 615 616 set_bit(IGC_RING_FLAG_TX_HWTSTAMP, &tx_ring->flags); 617 } 618 619 } 620 621 /** 622 * igc_ptp_set_timestamp_mode - setup hardware for timestamping 623 * @adapter: networking device structure 624 * @config: hwtstamp configuration 625 * 626 * Return: 0 in case of success, negative errno code otherwise. 627 */ 628 static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter, 629 struct kernel_hwtstamp_config *config) 630 { 631 switch (config->tx_type) { 632 case HWTSTAMP_TX_OFF: 633 igc_ptp_disable_tx_timestamp(adapter); 634 break; 635 case HWTSTAMP_TX_ON: 636 igc_ptp_enable_tx_timestamp(adapter); 637 break; 638 default: 639 return -ERANGE; 640 } 641 642 switch (config->rx_filter) { 643 case HWTSTAMP_FILTER_NONE: 644 igc_ptp_disable_rx_timestamp(adapter); 645 break; 646 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: 647 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: 648 case HWTSTAMP_FILTER_PTP_V2_EVENT: 649 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 650 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 651 case HWTSTAMP_FILTER_PTP_V2_SYNC: 652 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 653 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 654 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 655 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 656 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 657 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: 658 case HWTSTAMP_FILTER_NTP_ALL: 659 case HWTSTAMP_FILTER_ALL: 660 igc_ptp_enable_rx_timestamp(adapter); 661 config->rx_filter = HWTSTAMP_FILTER_ALL; 662 break; 663 default: 664 return -ERANGE; 665 } 666 667 return 0; 668 } 669 670 /* Requires adapter->ptp_tx_lock held by caller. */ 671 static void igc_ptp_tx_timeout(struct igc_adapter *adapter, 672 struct igc_tx_timestamp_request *tstamp) 673 { 674 if (tstamp->skb) 675 igc_ptp_free_tx_buffer(adapter, tstamp); 676 677 adapter->tx_hwtstamp_timeouts++; 678 679 netdev_warn(adapter->netdev, "Tx timestamp timeout\n"); 680 } 681 682 void igc_ptp_tx_hang(struct igc_adapter *adapter) 683 { 684 struct igc_tx_timestamp_request *tstamp; 685 struct igc_hw *hw = &adapter->hw; 686 unsigned long flags; 687 bool found = false; 688 int i; 689 690 spin_lock_irqsave(&adapter->ptp_tx_lock, flags); 691 692 for (i = 0; i < IGC_MAX_TX_TSTAMP_REGS; i++) { 693 tstamp = &adapter->tx_tstamp[i]; 694 695 if (!tstamp->skb) 696 continue; 697 698 if (time_is_after_jiffies(tstamp->start + IGC_PTP_TX_TIMEOUT)) 699 continue; 700 701 igc_ptp_tx_timeout(adapter, tstamp); 702 found = true; 703 } 704 705 if (found) { 706 /* Reading the high register of the first set of timestamp registers 707 * clears all the equivalent bits in the TSYNCTXCTL register. 708 */ 709 rd32(IGC_TXSTMPH_0); 710 } 711 712 spin_unlock_irqrestore(&adapter->ptp_tx_lock, flags); 713 } 714 715 static void igc_ptp_tx_reg_to_stamp(struct igc_adapter *adapter, 716 struct igc_tx_timestamp_request *tstamp, u64 regval) 717 { 718 struct skb_shared_hwtstamps shhwtstamps; 719 struct sk_buff *skb; 720 int adjust = 0; 721 722 skb = tstamp->skb; 723 if (!skb) 724 return; 725 726 if (igc_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval)) 727 return; 728 729 switch (adapter->link_speed) { 730 case SPEED_10: 731 adjust = IGC_I225_TX_LATENCY_10; 732 break; 733 case SPEED_100: 734 adjust = IGC_I225_TX_LATENCY_100; 735 break; 736 case SPEED_1000: 737 adjust = IGC_I225_TX_LATENCY_1000; 738 break; 739 case SPEED_2500: 740 adjust = IGC_I225_TX_LATENCY_2500; 741 break; 742 } 743 744 shhwtstamps.hwtstamp = 745 ktime_add_ns(shhwtstamps.hwtstamp, adjust); 746 747 /* Copy the tx hardware timestamp into xdp metadata or skb */ 748 if (tstamp->buffer_type == IGC_TX_BUFFER_TYPE_XSK) { 749 struct xsk_buff_pool *xsk_pool; 750 751 xsk_pool = adapter->tx_ring[tstamp->xsk_queue_index]->xsk_pool; 752 if (xsk_pool && xp_tx_metadata_enabled(xsk_pool)) { 753 xsk_tx_metadata_complete(&tstamp->xsk_meta, 754 &igc_xsk_tx_metadata_ops, 755 &shhwtstamps.hwtstamp); 756 } 757 } else { 758 skb_tstamp_tx(skb, &shhwtstamps); 759 } 760 761 igc_ptp_free_tx_buffer(adapter, tstamp); 762 } 763 764 /** 765 * igc_ptp_tx_hwtstamp - utility function which checks for TX time stamp 766 * @adapter: Board private structure 767 * 768 * Check against the ready mask for which of the timestamp register 769 * sets are ready to be retrieved, then retrieve that and notify the 770 * rest of the stack. 771 * 772 * Context: Expects adapter->ptp_tx_lock to be held by caller. 773 */ 774 static void igc_ptp_tx_hwtstamp(struct igc_adapter *adapter) 775 { 776 struct igc_hw *hw = &adapter->hw; 777 u32 txstmpl_old; 778 u64 regval; 779 u32 mask; 780 int i; 781 782 /* Establish baseline of TXSTMPL_0 before checking TXTT_0. 783 * This baseline is used to detect if a new timestamp arrives in 784 * register 0 during the hardware bug workaround below. 785 */ 786 txstmpl_old = rd32(IGC_TXSTMPL); 787 788 mask = rd32(IGC_TSYNCTXCTL) & IGC_TSYNCTXCTL_TXTT_ANY; 789 if (mask & IGC_TSYNCTXCTL_TXTT_0) { 790 regval = rd32(IGC_TXSTMPL); 791 regval |= (u64)rd32(IGC_TXSTMPH) << 32; 792 } else { 793 /* TXTT_0 not set - register 0 has no new timestamp initially. 794 * 795 * Hardware bug: Future timestamp interrupts won't fire unless 796 * TXSTMPH_0 is read, even if the timestamp was captured in 797 * registers 1-3. 798 * 799 * Workaround: Read TXSTMPH_0 here to enable future interrupts. 800 * However, this read clears TXTT_0. If a timestamp arrives in 801 * register 0 after checking TXTT_0 but before this read, it 802 * would be lost. 803 * 804 * To detect this race: We saved a baseline read of TXSTMPL_0 805 * before TXTT_0 check. After performing the workaround read of 806 * TXSTMPH_0, we read TXSTMPL_0 again. Since consecutive 807 * timestamps never share the same nanosecond value, a change 808 * between the baseline and new TXSTMPL_0 indicates a timestamp 809 * arrived during the race window. If so, read the complete 810 * timestamp. 811 */ 812 u32 txstmpl_new; 813 814 rd32(IGC_TXSTMPH); 815 txstmpl_new = rd32(IGC_TXSTMPL); 816 817 if (txstmpl_old == txstmpl_new) 818 goto done; 819 820 regval = txstmpl_new; 821 regval |= (u64)rd32(IGC_TXSTMPH) << 32; 822 } 823 824 igc_ptp_tx_reg_to_stamp(adapter, &adapter->tx_tstamp[0], regval); 825 826 done: 827 /* Now that the problematic first register was handled, we can 828 * retrieve the timestamps from the other registers 829 * (starting from '1') with less complications. 830 */ 831 for (i = 1; i < IGC_MAX_TX_TSTAMP_REGS; i++) { 832 struct igc_tx_timestamp_request *tstamp = &adapter->tx_tstamp[i]; 833 834 if (!(tstamp->mask & mask)) 835 continue; 836 837 regval = rd32(tstamp->regl); 838 regval |= (u64)rd32(tstamp->regh) << 32; 839 840 igc_ptp_tx_reg_to_stamp(adapter, tstamp, regval); 841 } 842 } 843 844 /** 845 * igc_ptp_tx_tstamp_event 846 * @adapter: board private structure 847 * 848 * Called when a TX timestamp interrupt happens to retrieve the 849 * timestamp and send it up to the socket. 850 */ 851 void igc_ptp_tx_tstamp_event(struct igc_adapter *adapter) 852 { 853 unsigned long flags; 854 855 spin_lock_irqsave(&adapter->ptp_tx_lock, flags); 856 857 igc_ptp_tx_hwtstamp(adapter); 858 859 spin_unlock_irqrestore(&adapter->ptp_tx_lock, flags); 860 } 861 862 /** 863 * igc_ptp_hwtstamp_set - set hardware time stamping config 864 * @netdev: network interface device structure 865 * @config: timestamping configuration structure 866 * @extack: netlink extended ack structure for error reporting 867 * 868 **/ 869 int igc_ptp_hwtstamp_set(struct net_device *netdev, 870 struct kernel_hwtstamp_config *config, 871 struct netlink_ext_ack *extack) 872 { 873 struct igc_adapter *adapter = netdev_priv(netdev); 874 int err; 875 876 err = igc_ptp_set_timestamp_mode(adapter, config); 877 if (err) 878 return err; 879 880 /* save these settings for future reference */ 881 adapter->tstamp_config = *config; 882 883 return 0; 884 } 885 886 /** 887 * igc_ptp_hwtstamp_get - get hardware time stamping config 888 * @netdev: network interface device structure 889 * @config: timestamping configuration structure 890 * 891 * Get the hwtstamp_config settings to return to the user. Rather than attempt 892 * to deconstruct the settings from the registers, just return a shadow copy 893 * of the last known settings. 894 **/ 895 int igc_ptp_hwtstamp_get(struct net_device *netdev, 896 struct kernel_hwtstamp_config *config) 897 { 898 struct igc_adapter *adapter = netdev_priv(netdev); 899 900 *config = adapter->tstamp_config; 901 902 return 0; 903 } 904 905 /* The two conditions below must be met for cross timestamping via 906 * PCIe PTM: 907 * 908 * 1. We have an way to convert the timestamps in the PTM messages 909 * to something related to the system clocks (right now, only 910 * X86 systems with support for the Always Running Timer allow that); 911 * 912 * 2. We have PTM enabled in the path from the device to the PCIe root port. 913 */ 914 static bool igc_is_crosststamp_supported(struct igc_adapter *adapter) 915 { 916 if (!IS_ENABLED(CONFIG_X86_TSC)) 917 return false; 918 919 /* FIXME: it was noticed that enabling support for PCIe PTM in 920 * some i225-V models could cause lockups when bringing the 921 * interface up/down. There should be no downsides to 922 * disabling crosstimestamping support for i225-V, as it 923 * doesn't have any PTP support. That way we gain some time 924 * while root causing the issue. 925 */ 926 if (adapter->pdev->device == IGC_DEV_ID_I225_V) 927 return false; 928 929 return pcie_ptm_enabled(adapter->pdev); 930 } 931 932 static struct system_counterval_t igc_device_tstamp_to_system(u64 tstamp) 933 { 934 #if IS_ENABLED(CONFIG_X86_TSC) && !defined(CONFIG_UML) 935 return (struct system_counterval_t) { 936 .cs_id = CSID_X86_ART, 937 .cycles = tstamp, 938 .use_nsecs = true, 939 }; 940 #else 941 return (struct system_counterval_t) { }; 942 #endif 943 } 944 945 static void igc_ptm_log_error(struct igc_adapter *adapter, u32 ptm_stat) 946 { 947 struct net_device *netdev = adapter->netdev; 948 949 switch (ptm_stat) { 950 case IGC_PTM_STAT_RET_ERR: 951 netdev_err(netdev, "PTM Error: Root port timeout\n"); 952 break; 953 case IGC_PTM_STAT_BAD_PTM_RES: 954 netdev_err(netdev, "PTM Error: Bad response, PTM Response Data expected\n"); 955 break; 956 case IGC_PTM_STAT_T4M1_OVFL: 957 netdev_err(netdev, "PTM Error: T4 minus T1 overflow\n"); 958 break; 959 case IGC_PTM_STAT_ADJUST_1ST: 960 netdev_err(netdev, "PTM Error: 1588 timer adjusted during first PTM cycle\n"); 961 break; 962 case IGC_PTM_STAT_ADJUST_CYC: 963 netdev_err(netdev, "PTM Error: 1588 timer adjusted during non-first PTM cycle\n"); 964 break; 965 default: 966 netdev_err(netdev, "PTM Error: Unknown error (%#x)\n", ptm_stat); 967 break; 968 } 969 } 970 971 /* The PTM lock: adapter->ptm_lock must be held when calling igc_ptm_trigger() */ 972 static void igc_ptm_trigger(struct igc_hw *hw) 973 { 974 u32 ctrl; 975 976 /* To "manually" start the PTM cycle we need to set the 977 * trigger (TRIG) bit 978 */ 979 ctrl = rd32(IGC_PTM_CTRL); 980 ctrl |= IGC_PTM_CTRL_TRIG; 981 wr32(IGC_PTM_CTRL, ctrl); 982 /* Perform flush after write to CTRL register otherwise 983 * transaction may not start 984 */ 985 wrfl(); 986 } 987 988 /* The PTM lock: adapter->ptm_lock must be held when calling igc_ptm_reset() */ 989 static void igc_ptm_reset(struct igc_hw *hw) 990 { 991 u32 ctrl; 992 993 ctrl = rd32(IGC_PTM_CTRL); 994 ctrl &= ~IGC_PTM_CTRL_TRIG; 995 wr32(IGC_PTM_CTRL, ctrl); 996 /* Write to clear all status */ 997 wr32(IGC_PTM_STAT, IGC_PTM_STAT_ALL); 998 } 999 1000 static int igc_phc_get_syncdevicetime(ktime_t *device, 1001 struct system_counterval_t *system, 1002 void *ctx) 1003 { 1004 struct igc_adapter *adapter = ctx; 1005 struct igc_hw *hw = &adapter->hw; 1006 u32 stat, t2_curr_h, t2_curr_l; 1007 int err, count = 100; 1008 ktime_t t1, t2_curr; 1009 1010 /* Doing this in a loop because in the event of a 1011 * badly timed (ha!) system clock adjustment, we may 1012 * get PTM errors from the PCI root, but these errors 1013 * are transitory. Repeating the process returns valid 1014 * data eventually. 1015 */ 1016 do { 1017 /* Get a snapshot of system clocks to use as historic value. */ 1018 ktime_get_snapshot(&adapter->snapshot); 1019 1020 igc_ptm_trigger(hw); 1021 1022 err = readx_poll_timeout(rd32, IGC_PTM_STAT, stat, 1023 stat, IGC_PTM_STAT_SLEEP, 1024 IGC_PTM_STAT_TIMEOUT); 1025 igc_ptm_reset(hw); 1026 1027 if (err < 0) { 1028 netdev_err(adapter->netdev, "Timeout reading IGC_PTM_STAT register\n"); 1029 return err; 1030 } 1031 1032 if ((stat & IGC_PTM_STAT_VALID) == IGC_PTM_STAT_VALID) 1033 break; 1034 1035 igc_ptm_log_error(adapter, stat); 1036 } while (--count); 1037 1038 if (!count) { 1039 netdev_err(adapter->netdev, "Exceeded number of tries for PTM cycle\n"); 1040 return -ETIMEDOUT; 1041 } 1042 1043 t1 = ktime_set(rd32(IGC_PTM_T1_TIM0_H), rd32(IGC_PTM_T1_TIM0_L)); 1044 1045 t2_curr_l = rd32(IGC_PTM_CURR_T2_L); 1046 t2_curr_h = rd32(IGC_PTM_CURR_T2_H); 1047 1048 /* FIXME: When the register that tells the endianness of the 1049 * PTM registers are implemented, check them here and add the 1050 * appropriate conversion. 1051 */ 1052 t2_curr_h = swab32(t2_curr_h); 1053 1054 t2_curr = ((s64)t2_curr_h << 32 | t2_curr_l); 1055 1056 *device = t1; 1057 *system = igc_device_tstamp_to_system(t2_curr); 1058 1059 return 0; 1060 } 1061 1062 static int igc_ptp_getcrosststamp(struct ptp_clock_info *ptp, 1063 struct system_device_crosststamp *cts) 1064 { 1065 struct igc_adapter *adapter = container_of(ptp, struct igc_adapter, 1066 ptp_caps); 1067 int ret; 1068 1069 /* This blocks until any in progress PTM transactions complete */ 1070 mutex_lock(&adapter->ptm_lock); 1071 1072 ret = get_device_system_crosststamp(igc_phc_get_syncdevicetime, 1073 adapter, &adapter->snapshot, cts); 1074 mutex_unlock(&adapter->ptm_lock); 1075 1076 return ret; 1077 } 1078 1079 static int igc_ptp_getcyclesx64(struct ptp_clock_info *ptp, 1080 struct timespec64 *ts, 1081 struct ptp_system_timestamp *sts) 1082 { 1083 struct igc_adapter *igc = container_of(ptp, struct igc_adapter, ptp_caps); 1084 struct igc_hw *hw = &igc->hw; 1085 unsigned long flags; 1086 1087 spin_lock_irqsave(&igc->free_timer_lock, flags); 1088 1089 ptp_read_system_prets(sts); 1090 ts->tv_nsec = rd32(IGC_SYSTIML_1); 1091 ts->tv_sec = rd32(IGC_SYSTIMH_1); 1092 ptp_read_system_postts(sts); 1093 1094 spin_unlock_irqrestore(&igc->free_timer_lock, flags); 1095 1096 return 0; 1097 } 1098 1099 /** 1100 * igc_ptp_init - Initialize PTP functionality 1101 * @adapter: Board private structure 1102 * 1103 * This function is called at device probe to initialize the PTP 1104 * functionality. 1105 */ 1106 void igc_ptp_init(struct igc_adapter *adapter) 1107 { 1108 struct net_device *netdev = adapter->netdev; 1109 struct igc_tx_timestamp_request *tstamp; 1110 struct igc_hw *hw = &adapter->hw; 1111 int i; 1112 1113 tstamp = &adapter->tx_tstamp[0]; 1114 tstamp->mask = IGC_TSYNCTXCTL_TXTT_0; 1115 tstamp->regl = IGC_TXSTMPL_0; 1116 tstamp->regh = IGC_TXSTMPH_0; 1117 tstamp->flags = 0; 1118 1119 tstamp = &adapter->tx_tstamp[1]; 1120 tstamp->mask = IGC_TSYNCTXCTL_TXTT_1; 1121 tstamp->regl = IGC_TXSTMPL_1; 1122 tstamp->regh = IGC_TXSTMPH_1; 1123 tstamp->flags = IGC_TX_FLAGS_TSTAMP_1; 1124 1125 tstamp = &adapter->tx_tstamp[2]; 1126 tstamp->mask = IGC_TSYNCTXCTL_TXTT_2; 1127 tstamp->regl = IGC_TXSTMPL_2; 1128 tstamp->regh = IGC_TXSTMPH_2; 1129 tstamp->flags = IGC_TX_FLAGS_TSTAMP_2; 1130 1131 tstamp = &adapter->tx_tstamp[3]; 1132 tstamp->mask = IGC_TSYNCTXCTL_TXTT_3; 1133 tstamp->regl = IGC_TXSTMPL_3; 1134 tstamp->regh = IGC_TXSTMPH_3; 1135 tstamp->flags = IGC_TX_FLAGS_TSTAMP_3; 1136 1137 switch (hw->mac.type) { 1138 case igc_i225: 1139 for (i = 0; i < IGC_N_SDP; i++) { 1140 struct ptp_pin_desc *ppd = &adapter->sdp_config[i]; 1141 1142 snprintf(ppd->name, sizeof(ppd->name), "SDP%d", i); 1143 ppd->index = i; 1144 ppd->func = PTP_PF_NONE; 1145 } 1146 snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr); 1147 adapter->ptp_caps.owner = THIS_MODULE; 1148 adapter->ptp_caps.max_adj = 62499999; 1149 adapter->ptp_caps.adjfine = igc_ptp_adjfine_i225; 1150 adapter->ptp_caps.adjtime = igc_ptp_adjtime_i225; 1151 adapter->ptp_caps.gettimex64 = igc_ptp_gettimex64_i225; 1152 adapter->ptp_caps.getcyclesx64 = igc_ptp_getcyclesx64; 1153 adapter->ptp_caps.settime64 = igc_ptp_settime_i225; 1154 adapter->ptp_caps.enable = igc_ptp_feature_enable_i225; 1155 adapter->ptp_caps.pps = 1; 1156 adapter->ptp_caps.pin_config = adapter->sdp_config; 1157 adapter->ptp_caps.n_ext_ts = IGC_N_EXTTS; 1158 adapter->ptp_caps.n_per_out = IGC_N_PEROUT; 1159 adapter->ptp_caps.supported_extts_flags = PTP_RISING_EDGE | 1160 PTP_FALLING_EDGE | 1161 PTP_STRICT_FLAGS; 1162 adapter->ptp_caps.n_pins = IGC_N_SDP; 1163 adapter->ptp_caps.verify = igc_ptp_verify_pin; 1164 1165 if (!igc_is_crosststamp_supported(adapter)) 1166 break; 1167 1168 adapter->ptp_caps.getcrosststamp = igc_ptp_getcrosststamp; 1169 break; 1170 default: 1171 adapter->ptp_clock = NULL; 1172 return; 1173 } 1174 1175 spin_lock_init(&adapter->ptp_tx_lock); 1176 spin_lock_init(&adapter->free_timer_lock); 1177 spin_lock_init(&adapter->tmreg_lock); 1178 mutex_init(&adapter->ptm_lock); 1179 1180 adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE; 1181 adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF; 1182 1183 adapter->prev_ptp_time = ktime_to_timespec64(ktime_get_real()); 1184 adapter->ptp_reset_start = ktime_get(); 1185 1186 adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps, 1187 &adapter->pdev->dev); 1188 if (IS_ERR(adapter->ptp_clock)) { 1189 adapter->ptp_clock = NULL; 1190 netdev_err(netdev, "ptp_clock_register failed\n"); 1191 mutex_destroy(&adapter->ptm_lock); 1192 } else if (adapter->ptp_clock) { 1193 netdev_info(netdev, "PHC added\n"); 1194 adapter->ptp_flags |= IGC_PTP_ENABLED; 1195 } 1196 } 1197 1198 static void igc_ptp_time_save(struct igc_adapter *adapter) 1199 { 1200 igc_ptp_read(adapter, &adapter->prev_ptp_time); 1201 adapter->ptp_reset_start = ktime_get(); 1202 } 1203 1204 static void igc_ptp_time_restore(struct igc_adapter *adapter) 1205 { 1206 struct timespec64 ts = adapter->prev_ptp_time; 1207 ktime_t delta; 1208 1209 delta = ktime_sub(ktime_get(), adapter->ptp_reset_start); 1210 1211 timespec64_add_ns(&ts, ktime_to_ns(delta)); 1212 1213 igc_ptp_write_i225(adapter, &ts); 1214 } 1215 1216 static void igc_ptm_stop(struct igc_adapter *adapter) 1217 { 1218 struct igc_hw *hw = &adapter->hw; 1219 u32 ctrl; 1220 1221 mutex_lock(&adapter->ptm_lock); 1222 ctrl = rd32(IGC_PTM_CTRL); 1223 ctrl &= ~IGC_PTM_CTRL_EN; 1224 1225 wr32(IGC_PTM_CTRL, ctrl); 1226 mutex_unlock(&adapter->ptm_lock); 1227 } 1228 1229 /** 1230 * igc_ptp_suspend - Disable PTP work items and prepare for suspend 1231 * @adapter: Board private structure 1232 * 1233 * This function stops the overflow check work and PTP Tx timestamp work, and 1234 * will prepare the device for OS suspend. 1235 */ 1236 void igc_ptp_suspend(struct igc_adapter *adapter) 1237 { 1238 if (!(adapter->ptp_flags & IGC_PTP_ENABLED)) 1239 return; 1240 1241 igc_ptp_clear_tx_tstamp(adapter); 1242 1243 if (pci_device_is_present(adapter->pdev)) { 1244 igc_ptp_time_save(adapter); 1245 igc_ptm_stop(adapter); 1246 } 1247 } 1248 1249 /** 1250 * igc_ptp_stop - Disable PTP device and stop the overflow check. 1251 * @adapter: Board private structure. 1252 * 1253 * This function stops the PTP support and cancels the delayed work. 1254 **/ 1255 void igc_ptp_stop(struct igc_adapter *adapter) 1256 { 1257 if (!(adapter->ptp_flags & IGC_PTP_ENABLED)) 1258 return; 1259 1260 igc_ptp_suspend(adapter); 1261 1262 adapter->ptp_flags &= ~IGC_PTP_ENABLED; 1263 if (adapter->ptp_clock) { 1264 ptp_clock_unregister(adapter->ptp_clock); 1265 netdev_info(adapter->netdev, "PHC removed\n"); 1266 adapter->ptp_flags &= ~IGC_PTP_ENABLED; 1267 } 1268 mutex_destroy(&adapter->ptm_lock); 1269 } 1270 1271 /** 1272 * igc_ptp_reset - Re-enable the adapter for PTP following a reset. 1273 * @adapter: Board private structure. 1274 * 1275 * This function handles the reset work required to re-enable the PTP device. 1276 **/ 1277 void igc_ptp_reset(struct igc_adapter *adapter) 1278 { 1279 struct igc_hw *hw = &adapter->hw; 1280 u32 cycle_ctrl, ctrl, stat; 1281 unsigned long flags; 1282 u32 timadj; 1283 1284 if (!(adapter->ptp_flags & IGC_PTP_ENABLED)) 1285 return; 1286 1287 /* reset the tstamp_config */ 1288 igc_ptp_set_timestamp_mode(adapter, &adapter->tstamp_config); 1289 1290 mutex_lock(&adapter->ptm_lock); 1291 1292 spin_lock_irqsave(&adapter->tmreg_lock, flags); 1293 1294 switch (adapter->hw.mac.type) { 1295 case igc_i225: 1296 timadj = rd32(IGC_TIMADJ); 1297 timadj |= IGC_TIMADJ_ADJUST_METH; 1298 wr32(IGC_TIMADJ, timadj); 1299 1300 wr32(IGC_TSAUXC, 0x0); 1301 wr32(IGC_TSSDP, 0x0); 1302 wr32(IGC_TSIM, 1303 IGC_TSICR_INTERRUPTS | 1304 (adapter->pps_sys_wrap_on ? IGC_TSICR_SYS_WRAP : 0)); 1305 wr32(IGC_IMS, IGC_IMS_TS); 1306 1307 if (!igc_is_crosststamp_supported(adapter)) 1308 break; 1309 1310 wr32(IGC_PCIE_DIG_DELAY, IGC_PCIE_DIG_DELAY_DEFAULT); 1311 wr32(IGC_PCIE_PHY_DELAY, IGC_PCIE_PHY_DELAY_DEFAULT); 1312 1313 cycle_ctrl = IGC_PTM_CYCLE_CTRL_CYC_TIME(IGC_PTM_CYC_TIME_DEFAULT); 1314 1315 wr32(IGC_PTM_CYCLE_CTRL, cycle_ctrl); 1316 1317 ctrl = IGC_PTM_CTRL_EN | 1318 IGC_PTM_CTRL_START_NOW | 1319 IGC_PTM_CTRL_SHRT_CYC(IGC_PTM_SHORT_CYC_DEFAULT) | 1320 IGC_PTM_CTRL_PTM_TO(IGC_PTM_TIMEOUT_DEFAULT); 1321 1322 wr32(IGC_PTM_CTRL, ctrl); 1323 1324 /* Force the first cycle to run. */ 1325 igc_ptm_trigger(hw); 1326 1327 if (readx_poll_timeout_atomic(rd32, IGC_PTM_STAT, stat, 1328 stat, IGC_PTM_STAT_SLEEP, 1329 IGC_PTM_STAT_TIMEOUT)) 1330 netdev_err(adapter->netdev, "Timeout reading IGC_PTM_STAT register\n"); 1331 1332 igc_ptm_reset(hw); 1333 break; 1334 default: 1335 /* No work to do. */ 1336 goto out; 1337 } 1338 1339 /* Re-initialize the timer. */ 1340 if (hw->mac.type == igc_i225) { 1341 igc_ptp_time_restore(adapter); 1342 } else { 1343 timecounter_init(&adapter->tc, &adapter->cc, 1344 ktime_to_ns(ktime_get_real())); 1345 } 1346 out: 1347 spin_unlock_irqrestore(&adapter->tmreg_lock, flags); 1348 1349 mutex_unlock(&adapter->ptm_lock); 1350 1351 wrfl(); 1352 } 1353