1// SPDX-License-Identifier: GPL-2.0 2/* Copyright(c) 1999 - 2018 Intel Corporation. */ 3 4#include <linux/bitfield.h> 5 6#include "e1000.h" 7 8/** 9 * e1000e_get_bus_info_pcie - Get PCIe bus information 10 * @hw: pointer to the HW structure 11 * 12 * Determines and stores the system bus information for a particular 13 * network interface. The following bus information is determined and stored: 14 * bus speed, bus width, type (PCIe), and PCIe function. 15 **/ 16s32 e1000e_get_bus_info_pcie(struct e1000_hw *hw) 17{ 18 struct pci_dev *pdev = hw->adapter->pdev; 19 struct e1000_mac_info *mac = &hw->mac; 20 struct e1000_bus_info *bus = &hw->bus; 21 u16 pcie_link_status; 22 23 if (!pci_pcie_cap(pdev)) { 24 bus->width = e1000_bus_width_unknown; 25 } else { 26 pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &pcie_link_status); 27 bus->width = (enum e1000_bus_width)FIELD_GET(PCI_EXP_LNKSTA_NLW, 28 pcie_link_status); 29 } 30 31 mac->ops.set_lan_id(hw); 32 33 return 0; 34} 35 36/** 37 * e1000_set_lan_id_multi_port_pcie - Set LAN id for PCIe multiple port devices 38 * 39 * @hw: pointer to the HW structure 40 * 41 * Determines the LAN function id by reading memory-mapped registers 42 * and swaps the port value if requested. 43 **/ 44void e1000_set_lan_id_multi_port_pcie(struct e1000_hw *hw) 45{ 46 struct e1000_bus_info *bus = &hw->bus; 47 u32 reg; 48 49 /* The status register reports the correct function number 50 * for the device regardless of function swap state. 51 */ 52 reg = er32(STATUS); 53 bus->func = FIELD_GET(E1000_STATUS_FUNC_MASK, reg); 54} 55 56/** 57 * e1000_set_lan_id_single_port - Set LAN id for a single port device 58 * @hw: pointer to the HW structure 59 * 60 * Sets the LAN function id to zero for a single port device. 61 **/ 62void e1000_set_lan_id_single_port(struct e1000_hw *hw) 63{ 64 struct e1000_bus_info *bus = &hw->bus; 65 66 bus->func = 0; 67} 68 69/** 70 * e1000_clear_vfta_generic - Clear VLAN filter table 71 * @hw: pointer to the HW structure 72 * 73 * Clears the register array which contains the VLAN filter table by 74 * setting all the values to 0. 75 **/ 76void e1000_clear_vfta_generic(struct e1000_hw *hw) 77{ 78 u32 offset; 79 80 for (offset = 0; offset < E1000_VLAN_FILTER_TBL_SIZE; offset++) { 81 E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset, 0); 82 e1e_flush(); 83 } 84} 85 86/** 87 * e1000_write_vfta_generic - Write value to VLAN filter table 88 * @hw: pointer to the HW structure 89 * @offset: register offset in VLAN filter table 90 * @value: register value written to VLAN filter table 91 * 92 * Writes value at the given offset in the register array which stores 93 * the VLAN filter table. 94 **/ 95void e1000_write_vfta_generic(struct e1000_hw *hw, u32 offset, u32 value) 96{ 97 E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset, value); 98 e1e_flush(); 99} 100 101/** 102 * e1000e_init_rx_addrs - Initialize receive address's 103 * @hw: pointer to the HW structure 104 * @rar_count: receive address registers 105 * 106 * Setup the receive address registers by setting the base receive address 107 * register to the devices MAC address and clearing all the other receive 108 * address registers to 0. 109 **/ 110void e1000e_init_rx_addrs(struct e1000_hw *hw, u16 rar_count) 111{ 112 u32 i; 113 u8 mac_addr[ETH_ALEN] = { 0 }; 114 115 /* Setup the receive address */ 116 e_dbg("Programming MAC Address into RAR[0]\n"); 117 118 hw->mac.ops.rar_set(hw, hw->mac.addr, 0); 119 120 /* Zero out the other (rar_entry_count - 1) receive addresses */ 121 e_dbg("Clearing RAR[1-%u]\n", rar_count - 1); 122 for (i = 1; i < rar_count; i++) 123 hw->mac.ops.rar_set(hw, mac_addr, i); 124} 125 126/** 127 * e1000_check_alt_mac_addr_generic - Check for alternate MAC addr 128 * @hw: pointer to the HW structure 129 * 130 * Checks the nvm for an alternate MAC address. An alternate MAC address 131 * can be setup by pre-boot software and must be treated like a permanent 132 * address and must override the actual permanent MAC address. If an 133 * alternate MAC address is found it is programmed into RAR0, replacing 134 * the permanent address that was installed into RAR0 by the Si on reset. 135 * This function will return SUCCESS unless it encounters an error while 136 * reading the EEPROM. 137 **/ 138s32 e1000_check_alt_mac_addr_generic(struct e1000_hw *hw) 139{ 140 u32 i; 141 s32 ret_val; 142 u16 offset, nvm_alt_mac_addr_offset, nvm_data; 143 u8 alt_mac_addr[ETH_ALEN]; 144 145 ret_val = e1000_read_nvm(hw, NVM_COMPAT, 1, &nvm_data); 146 if (ret_val) 147 return ret_val; 148 149 /* not supported on 82573 */ 150 if (hw->mac.type == e1000_82573) 151 return 0; 152 153 ret_val = e1000_read_nvm(hw, NVM_ALT_MAC_ADDR_PTR, 1, 154 &nvm_alt_mac_addr_offset); 155 if (ret_val) { 156 e_dbg("NVM Read Error\n"); 157 return ret_val; 158 } 159 160 if ((nvm_alt_mac_addr_offset == 0xFFFF) || 161 (nvm_alt_mac_addr_offset == 0x0000)) 162 /* There is no Alternate MAC Address */ 163 return 0; 164 165 if (hw->bus.func == E1000_FUNC_1) 166 nvm_alt_mac_addr_offset += E1000_ALT_MAC_ADDRESS_OFFSET_LAN1; 167 for (i = 0; i < ETH_ALEN; i += 2) { 168 offset = nvm_alt_mac_addr_offset + (i >> 1); 169 ret_val = e1000_read_nvm(hw, offset, 1, &nvm_data); 170 if (ret_val) { 171 e_dbg("NVM Read Error\n"); 172 return ret_val; 173 } 174 175 alt_mac_addr[i] = (u8)(nvm_data & 0xFF); 176 alt_mac_addr[i + 1] = (u8)(nvm_data >> 8); 177 } 178 179 /* if multicast bit is set, the alternate address will not be used */ 180 if (is_multicast_ether_addr(alt_mac_addr)) { 181 e_dbg("Ignoring Alternate Mac Address with MC bit set\n"); 182 return 0; 183 } 184 185 /* We have a valid alternate MAC address, and we want to treat it the 186 * same as the normal permanent MAC address stored by the HW into the 187 * RAR. Do this by mapping this address into RAR0. 188 */ 189 hw->mac.ops.rar_set(hw, alt_mac_addr, 0); 190 191 return 0; 192} 193 194u32 e1000e_rar_get_count_generic(struct e1000_hw *hw) 195{ 196 return hw->mac.rar_entry_count; 197} 198 199/** 200 * e1000e_rar_set_generic - Set receive address register 201 * @hw: pointer to the HW structure 202 * @addr: pointer to the receive address 203 * @index: receive address array register 204 * 205 * Sets the receive address array register at index to the address passed 206 * in by addr. 207 **/ 208int e1000e_rar_set_generic(struct e1000_hw *hw, u8 *addr, u32 index) 209{ 210 u32 rar_low, rar_high; 211 212 /* HW expects these in little endian so we reverse the byte order 213 * from network order (big endian) to little endian 214 */ 215 rar_low = ((u32)addr[0] | ((u32)addr[1] << 8) | 216 ((u32)addr[2] << 16) | ((u32)addr[3] << 24)); 217 218 rar_high = ((u32)addr[4] | ((u32)addr[5] << 8)); 219 220 /* If MAC address zero, no need to set the AV bit */ 221 if (rar_low || rar_high) 222 rar_high |= E1000_RAH_AV; 223 224 /* Some bridges will combine consecutive 32-bit writes into 225 * a single burst write, which will malfunction on some parts. 226 * The flushes avoid this. 227 */ 228 ew32(RAL(index), rar_low); 229 e1e_flush(); 230 ew32(RAH(index), rar_high); 231 e1e_flush(); 232 233 return 0; 234} 235 236/** 237 * e1000_hash_mc_addr - Generate a multicast hash value 238 * @hw: pointer to the HW structure 239 * @mc_addr: pointer to a multicast address 240 * 241 * Generates a multicast address hash value which is used to determine 242 * the multicast filter table array address and new table value. 243 **/ 244static u32 e1000_hash_mc_addr(struct e1000_hw *hw, u8 *mc_addr) 245{ 246 u32 hash_value, hash_mask; 247 u8 bit_shift = 0; 248 249 /* Register count multiplied by bits per register */ 250 hash_mask = (hw->mac.mta_reg_count * 32) - 1; 251 252 /* For a mc_filter_type of 0, bit_shift is the number of left-shifts 253 * where 0xFF would still fall within the hash mask. 254 */ 255 while (hash_mask >> bit_shift != 0xFF) 256 bit_shift++; 257 258 /* The portion of the address that is used for the hash table 259 * is determined by the mc_filter_type setting. 260 * The algorithm is such that there is a total of 8 bits of shifting. 261 * The bit_shift for a mc_filter_type of 0 represents the number of 262 * left-shifts where the MSB of mc_addr[5] would still fall within 263 * the hash_mask. Case 0 does this exactly. Since there are a total 264 * of 8 bits of shifting, then mc_addr[4] will shift right the 265 * remaining number of bits. Thus 8 - bit_shift. The rest of the 266 * cases are a variation of this algorithm...essentially raising the 267 * number of bits to shift mc_addr[5] left, while still keeping the 268 * 8-bit shifting total. 269 * 270 * For example, given the following Destination MAC Address and an 271 * mta register count of 128 (thus a 4096-bit vector and 0xFFF mask), 272 * we can see that the bit_shift for case 0 is 4. These are the hash 273 * values resulting from each mc_filter_type... 274 * [0] [1] [2] [3] [4] [5] 275 * 01 AA 00 12 34 56 276 * LSB MSB 277 * 278 * case 0: hash_value = ((0x34 >> 4) | (0x56 << 4)) & 0xFFF = 0x563 279 * case 1: hash_value = ((0x34 >> 3) | (0x56 << 5)) & 0xFFF = 0xAC6 280 * case 2: hash_value = ((0x34 >> 2) | (0x56 << 6)) & 0xFFF = 0x163 281 * case 3: hash_value = ((0x34 >> 0) | (0x56 << 8)) & 0xFFF = 0x634 282 */ 283 switch (hw->mac.mc_filter_type) { 284 default: 285 case 0: 286 break; 287 case 1: 288 bit_shift += 1; 289 break; 290 case 2: 291 bit_shift += 2; 292 break; 293 case 3: 294 bit_shift += 4; 295 break; 296 } 297 298 hash_value = hash_mask & (((mc_addr[4] >> (8 - bit_shift)) | 299 (((u16)mc_addr[5]) << bit_shift))); 300 301 return hash_value; 302} 303 304/** 305 * e1000e_update_mc_addr_list_generic - Update Multicast addresses 306 * @hw: pointer to the HW structure 307 * @mc_addr_list: array of multicast addresses to program 308 * @mc_addr_count: number of multicast addresses to program 309 * 310 * Updates entire Multicast Table Array. 311 * The caller must have a packed mc_addr_list of multicast addresses. 312 **/ 313void e1000e_update_mc_addr_list_generic(struct e1000_hw *hw, 314 u8 *mc_addr_list, u32 mc_addr_count) 315{ 316 u32 hash_value, hash_bit, hash_reg; 317 int i; 318 319 /* clear mta_shadow */ 320 memset(&hw->mac.mta_shadow, 0, sizeof(hw->mac.mta_shadow)); 321 322 /* update mta_shadow from mc_addr_list */ 323 for (i = 0; (u32)i < mc_addr_count; i++) { 324 hash_value = e1000_hash_mc_addr(hw, mc_addr_list); 325 326 hash_reg = (hash_value >> 5) & (hw->mac.mta_reg_count - 1); 327 hash_bit = hash_value & 0x1F; 328 329 hw->mac.mta_shadow[hash_reg] |= BIT(hash_bit); 330 mc_addr_list += (ETH_ALEN); 331 } 332 333 /* replace the entire MTA table */ 334 for (i = hw->mac.mta_reg_count - 1; i >= 0; i--) 335 E1000_WRITE_REG_ARRAY(hw, E1000_MTA, i, hw->mac.mta_shadow[i]); 336 e1e_flush(); 337} 338 339/** 340 * e1000e_clear_hw_cntrs_base - Clear base hardware counters 341 * @hw: pointer to the HW structure 342 * 343 * Clears the base hardware counters by reading the counter registers. 344 **/ 345void e1000e_clear_hw_cntrs_base(struct e1000_hw *hw) 346{ 347 er32(CRCERRS); 348 er32(SYMERRS); 349 er32(MPC); 350 er32(SCC); 351 er32(ECOL); 352 er32(MCC); 353 er32(LATECOL); 354 er32(COLC); 355 er32(DC); 356 er32(SEC); 357 er32(RLEC); 358 er32(XONRXC); 359 er32(XONTXC); 360 er32(XOFFRXC); 361 er32(XOFFTXC); 362 er32(FCRUC); 363 er32(GPRC); 364 er32(BPRC); 365 er32(MPRC); 366 er32(GPTC); 367 er32(GORCL); 368 er32(GORCH); 369 er32(GOTCL); 370 er32(GOTCH); 371 er32(RNBC); 372 er32(RUC); 373 er32(RFC); 374 er32(ROC); 375 er32(RJC); 376 er32(TORL); 377 er32(TORH); 378 er32(TOTL); 379 er32(TOTH); 380 er32(TPR); 381 er32(TPT); 382 er32(MPTC); 383 er32(BPTC); 384} 385 386/** 387 * e1000e_check_for_copper_link - Check for link (Copper) 388 * @hw: pointer to the HW structure 389 * 390 * Checks to see of the link status of the hardware has changed. If a 391 * change in link status has been detected, then we read the PHY registers 392 * to get the current speed/duplex if link exists. 393 **/ 394s32 e1000e_check_for_copper_link(struct e1000_hw *hw) 395{ 396 struct e1000_mac_info *mac = &hw->mac; 397 s32 ret_val; 398 bool link; 399 400 /* We only want to go out to the PHY registers to see if Auto-Neg 401 * has completed and/or if our link status has changed. The 402 * get_link_status flag is set upon receiving a Link Status 403 * Change or Rx Sequence Error interrupt. 404 */ 405 if (!mac->get_link_status) 406 return 0; 407 mac->get_link_status = false; 408 409 /* First we want to see if the MII Status Register reports 410 * link. If so, then we want to get the current speed/duplex 411 * of the PHY. 412 */ 413 ret_val = e1000e_phy_has_link_generic(hw, 1, 0, &link); 414 if (ret_val || !link) 415 goto out; 416 417 /* Check if there was DownShift, must be checked 418 * immediately after link-up 419 */ 420 e1000e_check_downshift(hw); 421 422 /* If we are forcing speed/duplex, then we simply return since 423 * we have already determined whether we have link or not. 424 */ 425 if (!mac->autoneg) 426 return -E1000_ERR_CONFIG; 427 428 /* Auto-Neg is enabled. Auto Speed Detection takes care 429 * of MAC speed/duplex configuration. So we only need to 430 * configure Collision Distance in the MAC. 431 */ 432 mac->ops.config_collision_dist(hw); 433 434 /* Configure Flow Control now that Auto-Neg has completed. 435 * First, we need to restore the desired flow control 436 * settings because we may have had to re-autoneg with a 437 * different link partner. 438 */ 439 ret_val = e1000e_config_fc_after_link_up(hw); 440 if (ret_val) 441 e_dbg("Error configuring flow control\n"); 442 443 return ret_val; 444 445out: 446 mac->get_link_status = true; 447 return ret_val; 448} 449 450/** 451 * e1000e_check_for_fiber_link - Check for link (Fiber) 452 * @hw: pointer to the HW structure 453 * 454 * Checks for link up on the hardware. If link is not up and we have 455 * a signal, then we need to force link up. 456 **/ 457s32 e1000e_check_for_fiber_link(struct e1000_hw *hw) 458{ 459 struct e1000_mac_info *mac = &hw->mac; 460 u32 rxcw; 461 u32 ctrl; 462 u32 status; 463 s32 ret_val; 464 465 ctrl = er32(CTRL); 466 status = er32(STATUS); 467 rxcw = er32(RXCW); 468 469 /* If we don't have link (auto-negotiation failed or link partner 470 * cannot auto-negotiate), the cable is plugged in (we have signal), 471 * and our link partner is not trying to auto-negotiate with us (we 472 * are receiving idles or data), we need to force link up. We also 473 * need to give auto-negotiation time to complete, in case the cable 474 * was just plugged in. The autoneg_failed flag does this. 475 */ 476 /* (ctrl & E1000_CTRL_SWDPIN1) == 1 == have signal */ 477 if ((ctrl & E1000_CTRL_SWDPIN1) && !(status & E1000_STATUS_LU) && 478 !(rxcw & E1000_RXCW_C)) { 479 if (!mac->autoneg_failed) { 480 mac->autoneg_failed = true; 481 return 0; 482 } 483 e_dbg("NOT Rx'ing /C/, disable AutoNeg and force link.\n"); 484 485 /* Disable auto-negotiation in the TXCW register */ 486 ew32(TXCW, (mac->txcw & ~E1000_TXCW_ANE)); 487 488 /* Force link-up and also force full-duplex. */ 489 ctrl = er32(CTRL); 490 ctrl |= (E1000_CTRL_SLU | E1000_CTRL_FD); 491 ew32(CTRL, ctrl); 492 493 /* Configure Flow Control after forcing link up. */ 494 ret_val = e1000e_config_fc_after_link_up(hw); 495 if (ret_val) { 496 e_dbg("Error configuring flow control\n"); 497 return ret_val; 498 } 499 } else if ((ctrl & E1000_CTRL_SLU) && (rxcw & E1000_RXCW_C)) { 500 /* If we are forcing link and we are receiving /C/ ordered 501 * sets, re-enable auto-negotiation in the TXCW register 502 * and disable forced link in the Device Control register 503 * in an attempt to auto-negotiate with our link partner. 504 */ 505 e_dbg("Rx'ing /C/, enable AutoNeg and stop forcing link.\n"); 506 ew32(TXCW, mac->txcw); 507 ew32(CTRL, (ctrl & ~E1000_CTRL_SLU)); 508 509 mac->serdes_has_link = true; 510 } 511 512 return 0; 513} 514 515/** 516 * e1000e_check_for_serdes_link - Check for link (Serdes) 517 * @hw: pointer to the HW structure 518 * 519 * Checks for link up on the hardware. If link is not up and we have 520 * a signal, then we need to force link up. 521 **/ 522s32 e1000e_check_for_serdes_link(struct e1000_hw *hw) 523{ 524 struct e1000_mac_info *mac = &hw->mac; 525 u32 rxcw; 526 u32 ctrl; 527 u32 status; 528 s32 ret_val; 529 530 ctrl = er32(CTRL); 531 status = er32(STATUS); 532 rxcw = er32(RXCW); 533 534 /* If we don't have link (auto-negotiation failed or link partner 535 * cannot auto-negotiate), and our link partner is not trying to 536 * auto-negotiate with us (we are receiving idles or data), 537 * we need to force link up. We also need to give auto-negotiation 538 * time to complete. 539 */ 540 /* (ctrl & E1000_CTRL_SWDPIN1) == 1 == have signal */ 541 if (!(status & E1000_STATUS_LU) && !(rxcw & E1000_RXCW_C)) { 542 if (!mac->autoneg_failed) { 543 mac->autoneg_failed = true; 544 return 0; 545 } 546 e_dbg("NOT Rx'ing /C/, disable AutoNeg and force link.\n"); 547 548 /* Disable auto-negotiation in the TXCW register */ 549 ew32(TXCW, (mac->txcw & ~E1000_TXCW_ANE)); 550 551 /* Force link-up and also force full-duplex. */ 552 ctrl = er32(CTRL); 553 ctrl |= (E1000_CTRL_SLU | E1000_CTRL_FD); 554 ew32(CTRL, ctrl); 555 556 /* Configure Flow Control after forcing link up. */ 557 ret_val = e1000e_config_fc_after_link_up(hw); 558 if (ret_val) { 559 e_dbg("Error configuring flow control\n"); 560 return ret_val; 561 } 562 } else if ((ctrl & E1000_CTRL_SLU) && (rxcw & E1000_RXCW_C)) { 563 /* If we are forcing link and we are receiving /C/ ordered 564 * sets, re-enable auto-negotiation in the TXCW register 565 * and disable forced link in the Device Control register 566 * in an attempt to auto-negotiate with our link partner. 567 */ 568 e_dbg("Rx'ing /C/, enable AutoNeg and stop forcing link.\n"); 569 ew32(TXCW, mac->txcw); 570 ew32(CTRL, (ctrl & ~E1000_CTRL_SLU)); 571 572 mac->serdes_has_link = true; 573 } else if (!(E1000_TXCW_ANE & er32(TXCW))) { 574 /* If we force link for non-auto-negotiation switch, check 575 * link status based on MAC synchronization for internal 576 * serdes media type. 577 */ 578 /* SYNCH bit and IV bit are sticky. */ 579 usleep_range(10, 20); 580 rxcw = er32(RXCW); 581 if (rxcw & E1000_RXCW_SYNCH) { 582 if (!(rxcw & E1000_RXCW_IV)) { 583 mac->serdes_has_link = true; 584 e_dbg("SERDES: Link up - forced.\n"); 585 } 586 } else { 587 mac->serdes_has_link = false; 588 e_dbg("SERDES: Link down - force failed.\n"); 589 } 590 } 591 592 if (E1000_TXCW_ANE & er32(TXCW)) { 593 status = er32(STATUS); 594 if (status & E1000_STATUS_LU) { 595 /* SYNCH bit and IV bit are sticky, so reread rxcw. */ 596 usleep_range(10, 20); 597 rxcw = er32(RXCW); 598 if (rxcw & E1000_RXCW_SYNCH) { 599 if (!(rxcw & E1000_RXCW_IV)) { 600 mac->serdes_has_link = true; 601 e_dbg("SERDES: Link up - autoneg completed successfully.\n"); 602 } else { 603 mac->serdes_has_link = false; 604 e_dbg("SERDES: Link down - invalid codewords detected in autoneg.\n"); 605 } 606 } else { 607 mac->serdes_has_link = false; 608 e_dbg("SERDES: Link down - no sync.\n"); 609 } 610 } else { 611 mac->serdes_has_link = false; 612 e_dbg("SERDES: Link down - autoneg failed\n"); 613 } 614 } 615 616 return 0; 617} 618 619/** 620 * e1000_set_default_fc_generic - Set flow control default values 621 * @hw: pointer to the HW structure 622 * 623 * Read the EEPROM for the default values for flow control and store the 624 * values. 625 **/ 626static s32 e1000_set_default_fc_generic(struct e1000_hw *hw) 627{ 628 s32 ret_val; 629 u16 nvm_data; 630 631 /* Read and store word 0x0F of the EEPROM. This word contains bits 632 * that determine the hardware's default PAUSE (flow control) mode, 633 * a bit that determines whether the HW defaults to enabling or 634 * disabling auto-negotiation, and the direction of the 635 * SW defined pins. If there is no SW over-ride of the flow 636 * control setting, then the variable hw->fc will 637 * be initialized based on a value in the EEPROM. 638 */ 639 ret_val = e1000_read_nvm(hw, NVM_INIT_CONTROL2_REG, 1, &nvm_data); 640 641 if (ret_val) { 642 e_dbg("NVM Read Error\n"); 643 return ret_val; 644 } 645 646 if (!(nvm_data & NVM_WORD0F_PAUSE_MASK)) 647 hw->fc.requested_mode = e1000_fc_none; 648 else if ((nvm_data & NVM_WORD0F_PAUSE_MASK) == NVM_WORD0F_ASM_DIR) 649 hw->fc.requested_mode = e1000_fc_tx_pause; 650 else 651 hw->fc.requested_mode = e1000_fc_full; 652 653 return 0; 654} 655 656/** 657 * e1000e_setup_link_generic - Setup flow control and link settings 658 * @hw: pointer to the HW structure 659 * 660 * Determines which flow control settings to use, then configures flow 661 * control. Calls the appropriate media-specific link configuration 662 * function. Assuming the adapter has a valid link partner, a valid link 663 * should be established. Assumes the hardware has previously been reset 664 * and the transmitter and receiver are not enabled. 665 **/ 666s32 e1000e_setup_link_generic(struct e1000_hw *hw) 667{ 668 s32 ret_val; 669 670 /* In the case of the phy reset being blocked, we already have a link. 671 * We do not need to set it up again. 672 */ 673 if (hw->phy.ops.check_reset_block && hw->phy.ops.check_reset_block(hw)) 674 return 0; 675 676 /* If requested flow control is set to default, set flow control 677 * based on the EEPROM flow control settings. 678 */ 679 if (hw->fc.requested_mode == e1000_fc_default) { 680 ret_val = e1000_set_default_fc_generic(hw); 681 if (ret_val) 682 return ret_val; 683 } 684 685 /* Save off the requested flow control mode for use later. Depending 686 * on the link partner's capabilities, we may or may not use this mode. 687 */ 688 hw->fc.current_mode = hw->fc.requested_mode; 689 690 e_dbg("After fix-ups FlowControl is now = %x\n", hw->fc.current_mode); 691 692 /* Call the necessary media_type subroutine to configure the link. */ 693 ret_val = hw->mac.ops.setup_physical_interface(hw); 694 if (ret_val) 695 return ret_val; 696 697 /* Initialize the flow control address, type, and PAUSE timer 698 * registers to their default values. This is done even if flow 699 * control is disabled, because it does not hurt anything to 700 * initialize these registers. 701 */ 702 e_dbg("Initializing the Flow Control address, type and timer regs\n"); 703 ew32(FCT, FLOW_CONTROL_TYPE); 704 ew32(FCAH, FLOW_CONTROL_ADDRESS_HIGH); 705 ew32(FCAL, FLOW_CONTROL_ADDRESS_LOW); 706 707 ew32(FCTTV, hw->fc.pause_time); 708 709 return e1000e_set_fc_watermarks(hw); 710} 711 712/** 713 * e1000_commit_fc_settings_generic - Configure flow control 714 * @hw: pointer to the HW structure 715 * 716 * Write the flow control settings to the Transmit Config Word Register (TXCW) 717 * base on the flow control settings in e1000_mac_info. 718 **/ 719static s32 e1000_commit_fc_settings_generic(struct e1000_hw *hw) 720{ 721 struct e1000_mac_info *mac = &hw->mac; 722 u32 txcw; 723 724 /* Check for a software override of the flow control settings, and 725 * setup the device accordingly. If auto-negotiation is enabled, then 726 * software will have to set the "PAUSE" bits to the correct value in 727 * the Transmit Config Word Register (TXCW) and re-start auto- 728 * negotiation. However, if auto-negotiation is disabled, then 729 * software will have to manually configure the two flow control enable 730 * bits in the CTRL register. 731 * 732 * The possible values of the "fc" parameter are: 733 * 0: Flow control is completely disabled 734 * 1: Rx flow control is enabled (we can receive pause frames, 735 * but not send pause frames). 736 * 2: Tx flow control is enabled (we can send pause frames but we 737 * do not support receiving pause frames). 738 * 3: Both Rx and Tx flow control (symmetric) are enabled. 739 */ 740 switch (hw->fc.current_mode) { 741 case e1000_fc_none: 742 /* Flow control completely disabled by a software over-ride. */ 743 txcw = (E1000_TXCW_ANE | E1000_TXCW_FD); 744 break; 745 case e1000_fc_rx_pause: 746 /* Rx Flow control is enabled and Tx Flow control is disabled 747 * by a software over-ride. Since there really isn't a way to 748 * advertise that we are capable of Rx Pause ONLY, we will 749 * advertise that we support both symmetric and asymmetric Rx 750 * PAUSE. Later, we will disable the adapter's ability to send 751 * PAUSE frames. 752 */ 753 txcw = (E1000_TXCW_ANE | E1000_TXCW_FD | E1000_TXCW_PAUSE_MASK); 754 break; 755 case e1000_fc_tx_pause: 756 /* Tx Flow control is enabled, and Rx Flow control is disabled, 757 * by a software over-ride. 758 */ 759 txcw = (E1000_TXCW_ANE | E1000_TXCW_FD | E1000_TXCW_ASM_DIR); 760 break; 761 case e1000_fc_full: 762 /* Flow control (both Rx and Tx) is enabled by a software 763 * over-ride. 764 */ 765 txcw = (E1000_TXCW_ANE | E1000_TXCW_FD | E1000_TXCW_PAUSE_MASK); 766 break; 767 default: 768 e_dbg("Flow control param set incorrectly\n"); 769 return -E1000_ERR_CONFIG; 770 } 771 772 ew32(TXCW, txcw); 773 mac->txcw = txcw; 774 775 return 0; 776} 777 778/** 779 * e1000_poll_fiber_serdes_link_generic - Poll for link up 780 * @hw: pointer to the HW structure 781 * 782 * Polls for link up by reading the status register, if link fails to come 783 * up with auto-negotiation, then the link is forced if a signal is detected. 784 **/ 785static s32 e1000_poll_fiber_serdes_link_generic(struct e1000_hw *hw) 786{ 787 struct e1000_mac_info *mac = &hw->mac; 788 u32 i, status; 789 s32 ret_val; 790 791 /* If we have a signal (the cable is plugged in, or assumed true for 792 * serdes media) then poll for a "Link-Up" indication in the Device 793 * Status Register. Time-out if a link isn't seen in 500 milliseconds 794 * seconds (Auto-negotiation should complete in less than 500 795 * milliseconds even if the other end is doing it in SW). 796 */ 797 for (i = 0; i < FIBER_LINK_UP_LIMIT; i++) { 798 usleep_range(10000, 11000); 799 status = er32(STATUS); 800 if (status & E1000_STATUS_LU) 801 break; 802 } 803 if (i == FIBER_LINK_UP_LIMIT) { 804 e_dbg("Never got a valid link from auto-neg!!!\n"); 805 mac->autoneg_failed = true; 806 /* AutoNeg failed to achieve a link, so we'll call 807 * mac->check_for_link. This routine will force the 808 * link up if we detect a signal. This will allow us to 809 * communicate with non-autonegotiating link partners. 810 */ 811 ret_val = mac->ops.check_for_link(hw); 812 if (ret_val) { 813 e_dbg("Error while checking for link\n"); 814 return ret_val; 815 } 816 mac->autoneg_failed = false; 817 } else { 818 mac->autoneg_failed = false; 819 e_dbg("Valid Link Found\n"); 820 } 821 822 return 0; 823} 824 825/** 826 * e1000e_setup_fiber_serdes_link - Setup link for fiber/serdes 827 * @hw: pointer to the HW structure 828 * 829 * Configures collision distance and flow control for fiber and serdes 830 * links. Upon successful setup, poll for link. 831 **/ 832s32 e1000e_setup_fiber_serdes_link(struct e1000_hw *hw) 833{ 834 u32 ctrl; 835 s32 ret_val; 836 837 ctrl = er32(CTRL); 838 839 /* Take the link out of reset */ 840 ctrl &= ~E1000_CTRL_LRST; 841 842 hw->mac.ops.config_collision_dist(hw); 843 844 ret_val = e1000_commit_fc_settings_generic(hw); 845 if (ret_val) 846 return ret_val; 847 848 /* Since auto-negotiation is enabled, take the link out of reset (the 849 * link will be in reset, because we previously reset the chip). This 850 * will restart auto-negotiation. If auto-negotiation is successful 851 * then the link-up status bit will be set and the flow control enable 852 * bits (RFCE and TFCE) will be set according to their negotiated value. 853 */ 854 e_dbg("Auto-negotiation enabled\n"); 855 856 ew32(CTRL, ctrl); 857 e1e_flush(); 858 usleep_range(1000, 2000); 859 860 /* For these adapters, the SW definable pin 1 is set when the optics 861 * detect a signal. If we have a signal, then poll for a "Link-Up" 862 * indication. 863 */ 864 if (hw->phy.media_type == e1000_media_type_internal_serdes || 865 (er32(CTRL) & E1000_CTRL_SWDPIN1)) { 866 ret_val = e1000_poll_fiber_serdes_link_generic(hw); 867 } else { 868 e_dbg("No signal detected\n"); 869 } 870 871 return ret_val; 872} 873 874/** 875 * e1000e_config_collision_dist_generic - Configure collision distance 876 * @hw: pointer to the HW structure 877 * 878 * Configures the collision distance to the default value and is used 879 * during link setup. 880 **/ 881void e1000e_config_collision_dist_generic(struct e1000_hw *hw) 882{ 883 u32 tctl; 884 885 tctl = er32(TCTL); 886 887 tctl &= ~E1000_TCTL_COLD; 888 tctl |= E1000_COLLISION_DISTANCE << E1000_COLD_SHIFT; 889 890 ew32(TCTL, tctl); 891 e1e_flush(); 892} 893 894/** 895 * e1000e_set_fc_watermarks - Set flow control high/low watermarks 896 * @hw: pointer to the HW structure 897 * 898 * Sets the flow control high/low threshold (watermark) registers. If 899 * flow control XON frame transmission is enabled, then set XON frame 900 * transmission as well. 901 **/ 902s32 e1000e_set_fc_watermarks(struct e1000_hw *hw) 903{ 904 u32 fcrtl = 0, fcrth = 0; 905 906 /* Set the flow control receive threshold registers. Normally, 907 * these registers will be set to a default threshold that may be 908 * adjusted later by the driver's runtime code. However, if the 909 * ability to transmit pause frames is not enabled, then these 910 * registers will be set to 0. 911 */ 912 if (hw->fc.current_mode & e1000_fc_tx_pause) { 913 /* We need to set up the Receive Threshold high and low water 914 * marks as well as (optionally) enabling the transmission of 915 * XON frames. 916 */ 917 fcrtl = hw->fc.low_water; 918 if (hw->fc.send_xon) 919 fcrtl |= E1000_FCRTL_XONE; 920 921 fcrth = hw->fc.high_water; 922 } 923 ew32(FCRTL, fcrtl); 924 ew32(FCRTH, fcrth); 925 926 return 0; 927} 928 929/** 930 * e1000e_force_mac_fc - Force the MAC's flow control settings 931 * @hw: pointer to the HW structure 932 * 933 * Force the MAC's flow control settings. Sets the TFCE and RFCE bits in the 934 * device control register to reflect the adapter settings. TFCE and RFCE 935 * need to be explicitly set by software when a copper PHY is used because 936 * autonegotiation is managed by the PHY rather than the MAC. Software must 937 * also configure these bits when link is forced on a fiber connection. 938 **/ 939s32 e1000e_force_mac_fc(struct e1000_hw *hw) 940{ 941 u32 ctrl; 942 943 ctrl = er32(CTRL); 944 945 /* Because we didn't get link via the internal auto-negotiation 946 * mechanism (we either forced link or we got link via PHY 947 * auto-neg), we have to manually enable/disable transmit an 948 * receive flow control. 949 * 950 * The "Case" statement below enables/disable flow control 951 * according to the "hw->fc.current_mode" parameter. 952 * 953 * The possible values of the "fc" parameter are: 954 * 0: Flow control is completely disabled 955 * 1: Rx flow control is enabled (we can receive pause 956 * frames but not send pause frames). 957 * 2: Tx flow control is enabled (we can send pause frames 958 * but we do not receive pause frames). 959 * 3: Both Rx and Tx flow control (symmetric) is enabled. 960 * other: No other values should be possible at this point. 961 */ 962 e_dbg("hw->fc.current_mode = %u\n", hw->fc.current_mode); 963 964 switch (hw->fc.current_mode) { 965 case e1000_fc_none: 966 ctrl &= (~(E1000_CTRL_TFCE | E1000_CTRL_RFCE)); 967 break; 968 case e1000_fc_rx_pause: 969 ctrl &= (~E1000_CTRL_TFCE); 970 ctrl |= E1000_CTRL_RFCE; 971 break; 972 case e1000_fc_tx_pause: 973 ctrl &= (~E1000_CTRL_RFCE); 974 ctrl |= E1000_CTRL_TFCE; 975 break; 976 case e1000_fc_full: 977 ctrl |= (E1000_CTRL_TFCE | E1000_CTRL_RFCE); 978 break; 979 default: 980 e_dbg("Flow control param set incorrectly\n"); 981 return -E1000_ERR_CONFIG; 982 } 983 984 ew32(CTRL, ctrl); 985 986 return 0; 987} 988 989/** 990 * e1000e_config_fc_after_link_up - Configures flow control after link 991 * @hw: pointer to the HW structure 992 * 993 * Checks the status of auto-negotiation after link up to ensure that the 994 * speed and duplex were not forced. If the link needed to be forced, then 995 * flow control needs to be forced also. If auto-negotiation is enabled 996 * and did not fail, then we configure flow control based on our link 997 * partner. 998 **/ 999s32 e1000e_config_fc_after_link_up(struct e1000_hw *hw) 1000{ 1001 struct e1000_mac_info *mac = &hw->mac; 1002 s32 ret_val = 0; 1003 u32 pcs_status_reg, pcs_adv_reg, pcs_lp_ability_reg, pcs_ctrl_reg; 1004 u16 mii_status_reg, mii_nway_adv_reg, mii_nway_lp_ability_reg; 1005 u16 speed, duplex; 1006 1007 /* Check for the case where we have fiber media and auto-neg failed 1008 * so we had to force link. In this case, we need to force the 1009 * configuration of the MAC to match the "fc" parameter. 1010 */ 1011 if (mac->autoneg_failed) { 1012 if (hw->phy.media_type == e1000_media_type_fiber || 1013 hw->phy.media_type == e1000_media_type_internal_serdes) 1014 ret_val = e1000e_force_mac_fc(hw); 1015 } else { 1016 if (hw->phy.media_type == e1000_media_type_copper) 1017 ret_val = e1000e_force_mac_fc(hw); 1018 } 1019 1020 if (ret_val) { 1021 e_dbg("Error forcing flow control settings\n"); 1022 return ret_val; 1023 } 1024 1025 /* Check for the case where we have copper media and auto-neg is 1026 * enabled. In this case, we need to check and see if Auto-Neg 1027 * has completed, and if so, how the PHY and link partner has 1028 * flow control configured. 1029 */ 1030 if ((hw->phy.media_type == e1000_media_type_copper) && mac->autoneg) { 1031 /* Read the MII Status Register and check to see if AutoNeg 1032 * has completed. We read this twice because this reg has 1033 * some "sticky" (latched) bits. 1034 */ 1035 ret_val = e1e_rphy(hw, MII_BMSR, &mii_status_reg); 1036 if (ret_val) 1037 return ret_val; 1038 ret_val = e1e_rphy(hw, MII_BMSR, &mii_status_reg); 1039 if (ret_val) 1040 return ret_val; 1041 1042 if (!(mii_status_reg & BMSR_ANEGCOMPLETE)) { 1043 e_dbg("Copper PHY and Auto Neg has not completed.\n"); 1044 return ret_val; 1045 } 1046 1047 /* The AutoNeg process has completed, so we now need to 1048 * read both the Auto Negotiation Advertisement 1049 * Register (Address 4) and the Auto_Negotiation Base 1050 * Page Ability Register (Address 5) to determine how 1051 * flow control was negotiated. 1052 */ 1053 ret_val = e1e_rphy(hw, MII_ADVERTISE, &mii_nway_adv_reg); 1054 if (ret_val) 1055 return ret_val; 1056 ret_val = e1e_rphy(hw, MII_LPA, &mii_nway_lp_ability_reg); 1057 if (ret_val) 1058 return ret_val; 1059 1060 /* Two bits in the Auto Negotiation Advertisement Register 1061 * (Address 4) and two bits in the Auto Negotiation Base 1062 * Page Ability Register (Address 5) determine flow control 1063 * for both the PHY and the link partner. The following 1064 * table, taken out of the IEEE 802.3ab/D6.0 dated March 25, 1065 * 1999, describes these PAUSE resolution bits and how flow 1066 * control is determined based upon these settings. 1067 * NOTE: DC = Don't Care 1068 * 1069 * LOCAL DEVICE | LINK PARTNER 1070 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | NIC Resolution 1071 *-------|---------|-------|---------|-------------------- 1072 * 0 | 0 | DC | DC | e1000_fc_none 1073 * 0 | 1 | 0 | DC | e1000_fc_none 1074 * 0 | 1 | 1 | 0 | e1000_fc_none 1075 * 0 | 1 | 1 | 1 | e1000_fc_tx_pause 1076 * 1 | 0 | 0 | DC | e1000_fc_none 1077 * 1 | DC | 1 | DC | e1000_fc_full 1078 * 1 | 1 | 0 | 0 | e1000_fc_none 1079 * 1 | 1 | 0 | 1 | e1000_fc_rx_pause 1080 * 1081 * Are both PAUSE bits set to 1? If so, this implies 1082 * Symmetric Flow Control is enabled at both ends. The 1083 * ASM_DIR bits are irrelevant per the spec. 1084 * 1085 * For Symmetric Flow Control: 1086 * 1087 * LOCAL DEVICE | LINK PARTNER 1088 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result 1089 *-------|---------|-------|---------|-------------------- 1090 * 1 | DC | 1 | DC | E1000_fc_full 1091 * 1092 */ 1093 if ((mii_nway_adv_reg & ADVERTISE_PAUSE_CAP) && 1094 (mii_nway_lp_ability_reg & LPA_PAUSE_CAP)) { 1095 /* Now we need to check if the user selected Rx ONLY 1096 * of pause frames. In this case, we had to advertise 1097 * FULL flow control because we could not advertise Rx 1098 * ONLY. Hence, we must now check to see if we need to 1099 * turn OFF the TRANSMISSION of PAUSE frames. 1100 */ 1101 if (hw->fc.requested_mode == e1000_fc_full) { 1102 hw->fc.current_mode = e1000_fc_full; 1103 e_dbg("Flow Control = FULL.\n"); 1104 } else { 1105 hw->fc.current_mode = e1000_fc_rx_pause; 1106 e_dbg("Flow Control = Rx PAUSE frames only.\n"); 1107 } 1108 } 1109 /* For receiving PAUSE frames ONLY. 1110 * 1111 * LOCAL DEVICE | LINK PARTNER 1112 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result 1113 *-------|---------|-------|---------|-------------------- 1114 * 0 | 1 | 1 | 1 | e1000_fc_tx_pause 1115 */ 1116 else if (!(mii_nway_adv_reg & ADVERTISE_PAUSE_CAP) && 1117 (mii_nway_adv_reg & ADVERTISE_PAUSE_ASYM) && 1118 (mii_nway_lp_ability_reg & LPA_PAUSE_CAP) && 1119 (mii_nway_lp_ability_reg & LPA_PAUSE_ASYM)) { 1120 hw->fc.current_mode = e1000_fc_tx_pause; 1121 e_dbg("Flow Control = Tx PAUSE frames only.\n"); 1122 } 1123 /* For transmitting PAUSE frames ONLY. 1124 * 1125 * LOCAL DEVICE | LINK PARTNER 1126 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result 1127 *-------|---------|-------|---------|-------------------- 1128 * 1 | 1 | 0 | 1 | e1000_fc_rx_pause 1129 */ 1130 else if ((mii_nway_adv_reg & ADVERTISE_PAUSE_CAP) && 1131 (mii_nway_adv_reg & ADVERTISE_PAUSE_ASYM) && 1132 !(mii_nway_lp_ability_reg & LPA_PAUSE_CAP) && 1133 (mii_nway_lp_ability_reg & LPA_PAUSE_ASYM)) { 1134 hw->fc.current_mode = e1000_fc_rx_pause; 1135 e_dbg("Flow Control = Rx PAUSE frames only.\n"); 1136 } else { 1137 /* Per the IEEE spec, at this point flow control 1138 * should be disabled. 1139 */ 1140 hw->fc.current_mode = e1000_fc_none; 1141 e_dbg("Flow Control = NONE.\n"); 1142 } 1143 1144 /* Now we need to do one last check... If we auto- 1145 * negotiated to HALF DUPLEX, flow control should not be 1146 * enabled per IEEE 802.3 spec. 1147 */ 1148 ret_val = mac->ops.get_link_up_info(hw, &speed, &duplex); 1149 if (ret_val) { 1150 e_dbg("Error getting link speed and duplex\n"); 1151 return ret_val; 1152 } 1153 1154 if (duplex == HALF_DUPLEX) 1155 hw->fc.current_mode = e1000_fc_none; 1156 1157 /* Now we call a subroutine to actually force the MAC 1158 * controller to use the correct flow control settings. 1159 */ 1160 ret_val = e1000e_force_mac_fc(hw); 1161 if (ret_val) { 1162 e_dbg("Error forcing flow control settings\n"); 1163 return ret_val; 1164 } 1165 } 1166 1167 /* Check for the case where we have SerDes media and auto-neg is 1168 * enabled. In this case, we need to check and see if Auto-Neg 1169 * has completed, and if so, how the PHY and link partner has 1170 * flow control configured. 1171 */ 1172 if ((hw->phy.media_type == e1000_media_type_internal_serdes) && 1173 mac->autoneg) { 1174 /* Read the PCS_LSTS and check to see if AutoNeg 1175 * has completed. 1176 */ 1177 pcs_status_reg = er32(PCS_LSTAT); 1178 1179 if (!(pcs_status_reg & E1000_PCS_LSTS_AN_COMPLETE)) { 1180 e_dbg("PCS Auto Neg has not completed.\n"); 1181 return ret_val; 1182 } 1183 1184 /* The AutoNeg process has completed, so we now need to 1185 * read both the Auto Negotiation Advertisement 1186 * Register (PCS_ANADV) and the Auto_Negotiation Base 1187 * Page Ability Register (PCS_LPAB) to determine how 1188 * flow control was negotiated. 1189 */ 1190 pcs_adv_reg = er32(PCS_ANADV); 1191 pcs_lp_ability_reg = er32(PCS_LPAB); 1192 1193 /* Two bits in the Auto Negotiation Advertisement Register 1194 * (PCS_ANADV) and two bits in the Auto Negotiation Base 1195 * Page Ability Register (PCS_LPAB) determine flow control 1196 * for both the PHY and the link partner. The following 1197 * table, taken out of the IEEE 802.3ab/D6.0 dated March 25, 1198 * 1999, describes these PAUSE resolution bits and how flow 1199 * control is determined based upon these settings. 1200 * NOTE: DC = Don't Care 1201 * 1202 * LOCAL DEVICE | LINK PARTNER 1203 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | NIC Resolution 1204 *-------|---------|-------|---------|-------------------- 1205 * 0 | 0 | DC | DC | e1000_fc_none 1206 * 0 | 1 | 0 | DC | e1000_fc_none 1207 * 0 | 1 | 1 | 0 | e1000_fc_none 1208 * 0 | 1 | 1 | 1 | e1000_fc_tx_pause 1209 * 1 | 0 | 0 | DC | e1000_fc_none 1210 * 1 | DC | 1 | DC | e1000_fc_full 1211 * 1 | 1 | 0 | 0 | e1000_fc_none 1212 * 1 | 1 | 0 | 1 | e1000_fc_rx_pause 1213 * 1214 * Are both PAUSE bits set to 1? If so, this implies 1215 * Symmetric Flow Control is enabled at both ends. The 1216 * ASM_DIR bits are irrelevant per the spec. 1217 * 1218 * For Symmetric Flow Control: 1219 * 1220 * LOCAL DEVICE | LINK PARTNER 1221 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result 1222 *-------|---------|-------|---------|-------------------- 1223 * 1 | DC | 1 | DC | e1000_fc_full 1224 * 1225 */ 1226 if ((pcs_adv_reg & E1000_TXCW_PAUSE) && 1227 (pcs_lp_ability_reg & E1000_TXCW_PAUSE)) { 1228 /* Now we need to check if the user selected Rx ONLY 1229 * of pause frames. In this case, we had to advertise 1230 * FULL flow control because we could not advertise Rx 1231 * ONLY. Hence, we must now check to see if we need to 1232 * turn OFF the TRANSMISSION of PAUSE frames. 1233 */ 1234 if (hw->fc.requested_mode == e1000_fc_full) { 1235 hw->fc.current_mode = e1000_fc_full; 1236 e_dbg("Flow Control = FULL.\n"); 1237 } else { 1238 hw->fc.current_mode = e1000_fc_rx_pause; 1239 e_dbg("Flow Control = Rx PAUSE frames only.\n"); 1240 } 1241 } 1242 /* For receiving PAUSE frames ONLY. 1243 * 1244 * LOCAL DEVICE | LINK PARTNER 1245 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result 1246 *-------|---------|-------|---------|-------------------- 1247 * 0 | 1 | 1 | 1 | e1000_fc_tx_pause 1248 */ 1249 else if (!(pcs_adv_reg & E1000_TXCW_PAUSE) && 1250 (pcs_adv_reg & E1000_TXCW_ASM_DIR) && 1251 (pcs_lp_ability_reg & E1000_TXCW_PAUSE) && 1252 (pcs_lp_ability_reg & E1000_TXCW_ASM_DIR)) { 1253 hw->fc.current_mode = e1000_fc_tx_pause; 1254 e_dbg("Flow Control = Tx PAUSE frames only.\n"); 1255 } 1256 /* For transmitting PAUSE frames ONLY. 1257 * 1258 * LOCAL DEVICE | LINK PARTNER 1259 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result 1260 *-------|---------|-------|---------|-------------------- 1261 * 1 | 1 | 0 | 1 | e1000_fc_rx_pause 1262 */ 1263 else if ((pcs_adv_reg & E1000_TXCW_PAUSE) && 1264 (pcs_adv_reg & E1000_TXCW_ASM_DIR) && 1265 !(pcs_lp_ability_reg & E1000_TXCW_PAUSE) && 1266 (pcs_lp_ability_reg & E1000_TXCW_ASM_DIR)) { 1267 hw->fc.current_mode = e1000_fc_rx_pause; 1268 e_dbg("Flow Control = Rx PAUSE frames only.\n"); 1269 } else { 1270 /* Per the IEEE spec, at this point flow control 1271 * should be disabled. 1272 */ 1273 hw->fc.current_mode = e1000_fc_none; 1274 e_dbg("Flow Control = NONE.\n"); 1275 } 1276 1277 /* Now we call a subroutine to actually force the MAC 1278 * controller to use the correct flow control settings. 1279 */ 1280 pcs_ctrl_reg = er32(PCS_LCTL); 1281 pcs_ctrl_reg |= E1000_PCS_LCTL_FORCE_FCTRL; 1282 ew32(PCS_LCTL, pcs_ctrl_reg); 1283 1284 ret_val = e1000e_force_mac_fc(hw); 1285 if (ret_val) { 1286 e_dbg("Error forcing flow control settings\n"); 1287 return ret_val; 1288 } 1289 } 1290 1291 return 0; 1292} 1293 1294/** 1295 * e1000e_get_speed_and_duplex_copper - Retrieve current speed/duplex 1296 * @hw: pointer to the HW structure 1297 * @speed: stores the current speed 1298 * @duplex: stores the current duplex 1299 * 1300 * Read the status register for the current speed/duplex and store the current 1301 * speed and duplex for copper connections. 1302 **/ 1303s32 e1000e_get_speed_and_duplex_copper(struct e1000_hw *hw, u16 *speed, 1304 u16 *duplex) 1305{ 1306 u32 status; 1307 1308 status = er32(STATUS); 1309 if (status & E1000_STATUS_SPEED_1000) 1310 *speed = SPEED_1000; 1311 else if (status & E1000_STATUS_SPEED_100) 1312 *speed = SPEED_100; 1313 else 1314 *speed = SPEED_10; 1315 1316 if (status & E1000_STATUS_FD) 1317 *duplex = FULL_DUPLEX; 1318 else 1319 *duplex = HALF_DUPLEX; 1320 1321 e_dbg("%u Mbps, %s Duplex\n", 1322 *speed == SPEED_1000 ? 1000 : *speed == SPEED_100 ? 100 : 10, 1323 *duplex == FULL_DUPLEX ? "Full" : "Half"); 1324 1325 return 0; 1326} 1327 1328/** 1329 * e1000e_get_speed_and_duplex_fiber_serdes - Retrieve current speed/duplex 1330 * @hw: pointer to the HW structure 1331 * @speed: stores the current speed 1332 * @duplex: stores the current duplex 1333 * 1334 * Sets the speed and duplex to gigabit full duplex (the only possible option) 1335 * for fiber/serdes links. 1336 **/ 1337s32 e1000e_get_speed_and_duplex_fiber_serdes(struct e1000_hw __always_unused 1338 *hw, u16 *speed, u16 *duplex) 1339{ 1340 *speed = SPEED_1000; 1341 *duplex = FULL_DUPLEX; 1342 1343 return 0; 1344} 1345 1346/** 1347 * e1000e_get_hw_semaphore - Acquire hardware semaphore 1348 * @hw: pointer to the HW structure 1349 * 1350 * Acquire the HW semaphore to access the PHY or NVM 1351 **/ 1352s32 e1000e_get_hw_semaphore(struct e1000_hw *hw) 1353{ 1354 u32 swsm; 1355 s32 timeout = hw->nvm.word_size + 1; 1356 s32 i = 0; 1357 1358 /* Get the SW semaphore */ 1359 while (i < timeout) { 1360 swsm = er32(SWSM); 1361 if (!(swsm & E1000_SWSM_SMBI)) 1362 break; 1363 1364 udelay(100); 1365 i++; 1366 } 1367 1368 if (i == timeout) { 1369 e_dbg("Driver can't access device - SMBI bit is set.\n"); 1370 return -E1000_ERR_NVM; 1371 } 1372 1373 /* Get the FW semaphore. */ 1374 for (i = 0; i < timeout; i++) { 1375 swsm = er32(SWSM); 1376 ew32(SWSM, swsm | E1000_SWSM_SWESMBI); 1377 1378 /* Semaphore acquired if bit latched */ 1379 if (er32(SWSM) & E1000_SWSM_SWESMBI) 1380 break; 1381 1382 udelay(100); 1383 } 1384 1385 if (i == timeout) { 1386 /* Release semaphores */ 1387 e1000e_put_hw_semaphore(hw); 1388 e_dbg("Driver can't access the NVM\n"); 1389 return -E1000_ERR_NVM; 1390 } 1391 1392 return 0; 1393} 1394 1395/** 1396 * e1000e_put_hw_semaphore - Release hardware semaphore 1397 * @hw: pointer to the HW structure 1398 * 1399 * Release hardware semaphore used to access the PHY or NVM 1400 **/ 1401void e1000e_put_hw_semaphore(struct e1000_hw *hw) 1402{ 1403 u32 swsm; 1404 1405 swsm = er32(SWSM); 1406 swsm &= ~(E1000_SWSM_SMBI | E1000_SWSM_SWESMBI); 1407 ew32(SWSM, swsm); 1408} 1409 1410/** 1411 * e1000e_get_auto_rd_done - Check for auto read completion 1412 * @hw: pointer to the HW structure 1413 * 1414 * Check EEPROM for Auto Read done bit. 1415 **/ 1416s32 e1000e_get_auto_rd_done(struct e1000_hw *hw) 1417{ 1418 s32 i = 0; 1419 1420 while (i < AUTO_READ_DONE_TIMEOUT) { 1421 if (er32(EECD) & E1000_EECD_AUTO_RD) 1422 break; 1423 usleep_range(1000, 2000); 1424 i++; 1425 } 1426 1427 if (i == AUTO_READ_DONE_TIMEOUT) { 1428 e_dbg("Auto read by HW from NVM has not completed.\n"); 1429 return -E1000_ERR_RESET; 1430 } 1431 1432 return 0; 1433} 1434 1435/** 1436 * e1000e_valid_led_default - Verify a valid default LED config 1437 * @hw: pointer to the HW structure 1438 * @data: pointer to the NVM (EEPROM) 1439 * 1440 * Read the EEPROM for the current default LED configuration. If the 1441 * LED configuration is not valid, set to a valid LED configuration. 1442 **/ 1443s32 e1000e_valid_led_default(struct e1000_hw *hw, u16 *data) 1444{ 1445 s32 ret_val; 1446 1447 ret_val = e1000_read_nvm(hw, NVM_ID_LED_SETTINGS, 1, data); 1448 if (ret_val) { 1449 e_dbg("NVM Read Error\n"); 1450 return ret_val; 1451 } 1452 1453 if (*data == ID_LED_RESERVED_0000 || *data == ID_LED_RESERVED_FFFF) 1454 *data = ID_LED_DEFAULT; 1455 1456 return 0; 1457} 1458 1459/** 1460 * e1000e_id_led_init_generic - 1461 * @hw: pointer to the HW structure 1462 * 1463 **/ 1464s32 e1000e_id_led_init_generic(struct e1000_hw *hw) 1465{ 1466 struct e1000_mac_info *mac = &hw->mac; 1467 s32 ret_val; 1468 const u32 ledctl_mask = 0x000000FF; 1469 const u32 ledctl_on = E1000_LEDCTL_MODE_LED_ON; 1470 const u32 ledctl_off = E1000_LEDCTL_MODE_LED_OFF; 1471 u16 data, i, temp; 1472 const u16 led_mask = 0x0F; 1473 1474 ret_val = hw->nvm.ops.valid_led_default(hw, &data); 1475 if (ret_val) 1476 return ret_val; 1477 1478 mac->ledctl_default = er32(LEDCTL); 1479 mac->ledctl_mode1 = mac->ledctl_default; 1480 mac->ledctl_mode2 = mac->ledctl_default; 1481 1482 for (i = 0; i < 4; i++) { 1483 temp = (data >> (i << 2)) & led_mask; 1484 switch (temp) { 1485 case ID_LED_ON1_DEF2: 1486 case ID_LED_ON1_ON2: 1487 case ID_LED_ON1_OFF2: 1488 mac->ledctl_mode1 &= ~(ledctl_mask << (i << 3)); 1489 mac->ledctl_mode1 |= ledctl_on << (i << 3); 1490 break; 1491 case ID_LED_OFF1_DEF2: 1492 case ID_LED_OFF1_ON2: 1493 case ID_LED_OFF1_OFF2: 1494 mac->ledctl_mode1 &= ~(ledctl_mask << (i << 3)); 1495 mac->ledctl_mode1 |= ledctl_off << (i << 3); 1496 break; 1497 default: 1498 /* Do nothing */ 1499 break; 1500 } 1501 switch (temp) { 1502 case ID_LED_DEF1_ON2: 1503 case ID_LED_ON1_ON2: 1504 case ID_LED_OFF1_ON2: 1505 mac->ledctl_mode2 &= ~(ledctl_mask << (i << 3)); 1506 mac->ledctl_mode2 |= ledctl_on << (i << 3); 1507 break; 1508 case ID_LED_DEF1_OFF2: 1509 case ID_LED_ON1_OFF2: 1510 case ID_LED_OFF1_OFF2: 1511 mac->ledctl_mode2 &= ~(ledctl_mask << (i << 3)); 1512 mac->ledctl_mode2 |= ledctl_off << (i << 3); 1513 break; 1514 default: 1515 /* Do nothing */ 1516 break; 1517 } 1518 } 1519 1520 return 0; 1521} 1522 1523/** 1524 * e1000e_setup_led_generic - Configures SW controllable LED 1525 * @hw: pointer to the HW structure 1526 * 1527 * This prepares the SW controllable LED for use and saves the current state 1528 * of the LED so it can be later restored. 1529 **/ 1530s32 e1000e_setup_led_generic(struct e1000_hw *hw) 1531{ 1532 u32 ledctl; 1533 1534 if (hw->mac.ops.setup_led != e1000e_setup_led_generic) 1535 return -E1000_ERR_CONFIG; 1536 1537 if (hw->phy.media_type == e1000_media_type_fiber) { 1538 ledctl = er32(LEDCTL); 1539 hw->mac.ledctl_default = ledctl; 1540 /* Turn off LED0 */ 1541 ledctl &= ~(E1000_LEDCTL_LED0_IVRT | E1000_LEDCTL_LED0_BLINK | 1542 E1000_LEDCTL_LED0_MODE_MASK); 1543 ledctl |= (E1000_LEDCTL_MODE_LED_OFF << 1544 E1000_LEDCTL_LED0_MODE_SHIFT); 1545 ew32(LEDCTL, ledctl); 1546 } else if (hw->phy.media_type == e1000_media_type_copper) { 1547 ew32(LEDCTL, hw->mac.ledctl_mode1); 1548 } 1549 1550 return 0; 1551} 1552 1553/** 1554 * e1000e_cleanup_led_generic - Set LED config to default operation 1555 * @hw: pointer to the HW structure 1556 * 1557 * Remove the current LED configuration and set the LED configuration 1558 * to the default value, saved from the EEPROM. 1559 **/ 1560s32 e1000e_cleanup_led_generic(struct e1000_hw *hw) 1561{ 1562 ew32(LEDCTL, hw->mac.ledctl_default); 1563 return 0; 1564} 1565 1566/** 1567 * e1000e_blink_led_generic - Blink LED 1568 * @hw: pointer to the HW structure 1569 * 1570 * Blink the LEDs which are set to be on. 1571 **/ 1572s32 e1000e_blink_led_generic(struct e1000_hw *hw) 1573{ 1574 u32 ledctl_blink = 0; 1575 u32 i; 1576 1577 if (hw->phy.media_type == e1000_media_type_fiber) { 1578 /* always blink LED0 for PCI-E fiber */ 1579 ledctl_blink = E1000_LEDCTL_LED0_BLINK | 1580 (E1000_LEDCTL_MODE_LED_ON << E1000_LEDCTL_LED0_MODE_SHIFT); 1581 } else { 1582 /* Set the blink bit for each LED that's "on" (0x0E) 1583 * (or "off" if inverted) in ledctl_mode2. The blink 1584 * logic in hardware only works when mode is set to "on" 1585 * so it must be changed accordingly when the mode is 1586 * "off" and inverted. 1587 */ 1588 ledctl_blink = hw->mac.ledctl_mode2; 1589 for (i = 0; i < 32; i += 8) { 1590 u32 mode = (hw->mac.ledctl_mode2 >> i) & 1591 E1000_LEDCTL_LED0_MODE_MASK; 1592 u32 led_default = hw->mac.ledctl_default >> i; 1593 1594 if ((!(led_default & E1000_LEDCTL_LED0_IVRT) && 1595 (mode == E1000_LEDCTL_MODE_LED_ON)) || 1596 ((led_default & E1000_LEDCTL_LED0_IVRT) && 1597 (mode == E1000_LEDCTL_MODE_LED_OFF))) { 1598 ledctl_blink &= 1599 ~(E1000_LEDCTL_LED0_MODE_MASK << i); 1600 ledctl_blink |= (E1000_LEDCTL_LED0_BLINK | 1601 E1000_LEDCTL_MODE_LED_ON) << i; 1602 } 1603 } 1604 } 1605 1606 ew32(LEDCTL, ledctl_blink); 1607 1608 return 0; 1609} 1610 1611/** 1612 * e1000e_led_on_generic - Turn LED on 1613 * @hw: pointer to the HW structure 1614 * 1615 * Turn LED on. 1616 **/ 1617s32 e1000e_led_on_generic(struct e1000_hw *hw) 1618{ 1619 u32 ctrl; 1620 1621 switch (hw->phy.media_type) { 1622 case e1000_media_type_fiber: 1623 ctrl = er32(CTRL); 1624 ctrl &= ~E1000_CTRL_SWDPIN0; 1625 ctrl |= E1000_CTRL_SWDPIO0; 1626 ew32(CTRL, ctrl); 1627 break; 1628 case e1000_media_type_copper: 1629 ew32(LEDCTL, hw->mac.ledctl_mode2); 1630 break; 1631 default: 1632 break; 1633 } 1634 1635 return 0; 1636} 1637 1638/** 1639 * e1000e_led_off_generic - Turn LED off 1640 * @hw: pointer to the HW structure 1641 * 1642 * Turn LED off. 1643 **/ 1644s32 e1000e_led_off_generic(struct e1000_hw *hw) 1645{ 1646 u32 ctrl; 1647 1648 switch (hw->phy.media_type) { 1649 case e1000_media_type_fiber: 1650 ctrl = er32(CTRL); 1651 ctrl |= E1000_CTRL_SWDPIN0; 1652 ctrl |= E1000_CTRL_SWDPIO0; 1653 ew32(CTRL, ctrl); 1654 break; 1655 case e1000_media_type_copper: 1656 ew32(LEDCTL, hw->mac.ledctl_mode1); 1657 break; 1658 default: 1659 break; 1660 } 1661 1662 return 0; 1663} 1664 1665/** 1666 * e1000e_set_pcie_no_snoop - Set PCI-express capabilities 1667 * @hw: pointer to the HW structure 1668 * @no_snoop: bitmap of snoop events 1669 * 1670 * Set the PCI-express register to snoop for events enabled in 'no_snoop'. 1671 **/ 1672void e1000e_set_pcie_no_snoop(struct e1000_hw *hw, u32 no_snoop) 1673{ 1674 u32 gcr; 1675 1676 if (no_snoop) { 1677 gcr = er32(GCR); 1678 gcr &= ~(PCIE_NO_SNOOP_ALL); 1679 gcr |= no_snoop; 1680 ew32(GCR, gcr); 1681 } 1682} 1683 1684/** 1685 * e1000e_disable_pcie_master - Disables PCI-express master access 1686 * @hw: pointer to the HW structure 1687 * 1688 * Returns 0 if successful, else returns -10 1689 * (-E1000_ERR_MASTER_REQUESTS_PENDING) if master disable bit has not caused 1690 * the master requests to be disabled. 1691 * 1692 * Disables PCI-Express master access and verifies there are no pending 1693 * requests. 1694 **/ 1695s32 e1000e_disable_pcie_master(struct e1000_hw *hw) 1696{ 1697 u32 ctrl; 1698 s32 timeout = MASTER_DISABLE_TIMEOUT; 1699 1700 ctrl = er32(CTRL); 1701 ctrl |= E1000_CTRL_GIO_MASTER_DISABLE; 1702 ew32(CTRL, ctrl); 1703 1704 while (timeout) { 1705 if (!(er32(STATUS) & E1000_STATUS_GIO_MASTER_ENABLE)) 1706 break; 1707 usleep_range(100, 200); 1708 timeout--; 1709 } 1710 1711 if (!timeout) { 1712 e_dbg("Master requests are pending.\n"); 1713 return -E1000_ERR_MASTER_REQUESTS_PENDING; 1714 } 1715 1716 return 0; 1717} 1718 1719/** 1720 * e1000e_reset_adaptive - Reset Adaptive Interframe Spacing 1721 * @hw: pointer to the HW structure 1722 * 1723 * Reset the Adaptive Interframe Spacing throttle to default values. 1724 **/ 1725void e1000e_reset_adaptive(struct e1000_hw *hw) 1726{ 1727 struct e1000_mac_info *mac = &hw->mac; 1728 1729 if (!mac->adaptive_ifs) { 1730 e_dbg("Not in Adaptive IFS mode!\n"); 1731 return; 1732 } 1733 1734 mac->current_ifs_val = 0; 1735 mac->ifs_min_val = IFS_MIN; 1736 mac->ifs_max_val = IFS_MAX; 1737 mac->ifs_step_size = IFS_STEP; 1738 mac->ifs_ratio = IFS_RATIO; 1739 1740 mac->in_ifs_mode = false; 1741 ew32(AIT, 0); 1742} 1743 1744/** 1745 * e1000e_update_adaptive - Update Adaptive Interframe Spacing 1746 * @hw: pointer to the HW structure 1747 * 1748 * Update the Adaptive Interframe Spacing Throttle value based on the 1749 * time between transmitted packets and time between collisions. 1750 **/ 1751void e1000e_update_adaptive(struct e1000_hw *hw) 1752{ 1753 struct e1000_mac_info *mac = &hw->mac; 1754 1755 if (!mac->adaptive_ifs) { 1756 e_dbg("Not in Adaptive IFS mode!\n"); 1757 return; 1758 } 1759 1760 if ((mac->collision_delta * mac->ifs_ratio) > mac->tx_packet_delta) { 1761 if (mac->tx_packet_delta > MIN_NUM_XMITS) { 1762 mac->in_ifs_mode = true; 1763 if (mac->current_ifs_val < mac->ifs_max_val) { 1764 if (!mac->current_ifs_val) 1765 mac->current_ifs_val = mac->ifs_min_val; 1766 else 1767 mac->current_ifs_val += 1768 mac->ifs_step_size; 1769 ew32(AIT, mac->current_ifs_val); 1770 } 1771 } 1772 } else { 1773 if (mac->in_ifs_mode && 1774 (mac->tx_packet_delta <= MIN_NUM_XMITS)) { 1775 mac->current_ifs_val = 0; 1776 mac->in_ifs_mode = false; 1777 ew32(AIT, 0); 1778 } 1779 } 1780} 1781