1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */ 3 4 /* TSN endpoint Ethernet MAC driver 5 * 6 * The TSN endpoint Ethernet MAC is a FPGA based network device for real-time 7 * communication. It is designed for endpoints within TSN (Time Sensitive 8 * Networking) networks; e.g., for PLCs in the industrial automation case. 9 * 10 * It supports multiple TX/RX queue pairs. The first TX/RX queue pair is used 11 * by the driver. 12 * 13 * More information can be found here: 14 * - www.embedded-experts.at/tsn 15 * - www.engleder-embedded.com 16 */ 17 18 #include "tsnep.h" 19 #include "tsnep_hw.h" 20 21 #include <linux/module.h> 22 #include <linux/of.h> 23 #include <linux/of_net.h> 24 #include <linux/of_mdio.h> 25 #include <linux/interrupt.h> 26 #include <linux/etherdevice.h> 27 #include <linux/phy.h> 28 #include <linux/iopoll.h> 29 30 #define TSNEP_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN) 31 #define TSNEP_HEADROOM ALIGN(TSNEP_SKB_PAD, 4) 32 #define TSNEP_MAX_RX_BUF_SIZE (PAGE_SIZE - TSNEP_HEADROOM - \ 33 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) 34 35 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT 36 #define DMA_ADDR_HIGH(dma_addr) ((u32)(((dma_addr) >> 32) & 0xFFFFFFFF)) 37 #else 38 #define DMA_ADDR_HIGH(dma_addr) ((u32)(0)) 39 #endif 40 #define DMA_ADDR_LOW(dma_addr) ((u32)((dma_addr) & 0xFFFFFFFF)) 41 42 #define TSNEP_COALESCE_USECS_DEFAULT 64 43 #define TSNEP_COALESCE_USECS_MAX ((ECM_INT_DELAY_MASK >> ECM_INT_DELAY_SHIFT) * \ 44 ECM_INT_DELAY_BASE_US + ECM_INT_DELAY_BASE_US - 1) 45 46 static void tsnep_enable_irq(struct tsnep_adapter *adapter, u32 mask) 47 { 48 iowrite32(mask, adapter->addr + ECM_INT_ENABLE); 49 } 50 51 static void tsnep_disable_irq(struct tsnep_adapter *adapter, u32 mask) 52 { 53 mask |= ECM_INT_DISABLE; 54 iowrite32(mask, adapter->addr + ECM_INT_ENABLE); 55 } 56 57 static irqreturn_t tsnep_irq(int irq, void *arg) 58 { 59 struct tsnep_adapter *adapter = arg; 60 u32 active = ioread32(adapter->addr + ECM_INT_ACTIVE); 61 62 /* acknowledge interrupt */ 63 if (active != 0) 64 iowrite32(active, adapter->addr + ECM_INT_ACKNOWLEDGE); 65 66 /* handle link interrupt */ 67 if ((active & ECM_INT_LINK) != 0) 68 phy_mac_interrupt(adapter->netdev->phydev); 69 70 /* handle TX/RX queue 0 interrupt */ 71 if ((active & adapter->queue[0].irq_mask) != 0) { 72 tsnep_disable_irq(adapter, adapter->queue[0].irq_mask); 73 napi_schedule(&adapter->queue[0].napi); 74 } 75 76 return IRQ_HANDLED; 77 } 78 79 static irqreturn_t tsnep_irq_txrx(int irq, void *arg) 80 { 81 struct tsnep_queue *queue = arg; 82 83 /* handle TX/RX queue interrupt */ 84 tsnep_disable_irq(queue->adapter, queue->irq_mask); 85 napi_schedule(&queue->napi); 86 87 return IRQ_HANDLED; 88 } 89 90 int tsnep_set_irq_coalesce(struct tsnep_queue *queue, u32 usecs) 91 { 92 if (usecs > TSNEP_COALESCE_USECS_MAX) 93 return -ERANGE; 94 95 usecs /= ECM_INT_DELAY_BASE_US; 96 usecs <<= ECM_INT_DELAY_SHIFT; 97 usecs &= ECM_INT_DELAY_MASK; 98 99 queue->irq_delay &= ~ECM_INT_DELAY_MASK; 100 queue->irq_delay |= usecs; 101 iowrite8(queue->irq_delay, queue->irq_delay_addr); 102 103 return 0; 104 } 105 106 u32 tsnep_get_irq_coalesce(struct tsnep_queue *queue) 107 { 108 u32 usecs; 109 110 usecs = (queue->irq_delay & ECM_INT_DELAY_MASK); 111 usecs >>= ECM_INT_DELAY_SHIFT; 112 usecs *= ECM_INT_DELAY_BASE_US; 113 114 return usecs; 115 } 116 117 static int tsnep_mdiobus_read(struct mii_bus *bus, int addr, int regnum) 118 { 119 struct tsnep_adapter *adapter = bus->priv; 120 u32 md; 121 int retval; 122 123 if (regnum & MII_ADDR_C45) 124 return -EOPNOTSUPP; 125 126 md = ECM_MD_READ; 127 if (!adapter->suppress_preamble) 128 md |= ECM_MD_PREAMBLE; 129 md |= (regnum << ECM_MD_ADDR_SHIFT) & ECM_MD_ADDR_MASK; 130 md |= (addr << ECM_MD_PHY_ADDR_SHIFT) & ECM_MD_PHY_ADDR_MASK; 131 iowrite32(md, adapter->addr + ECM_MD_CONTROL); 132 retval = readl_poll_timeout_atomic(adapter->addr + ECM_MD_STATUS, md, 133 !(md & ECM_MD_BUSY), 16, 1000); 134 if (retval != 0) 135 return retval; 136 137 return (md & ECM_MD_DATA_MASK) >> ECM_MD_DATA_SHIFT; 138 } 139 140 static int tsnep_mdiobus_write(struct mii_bus *bus, int addr, int regnum, 141 u16 val) 142 { 143 struct tsnep_adapter *adapter = bus->priv; 144 u32 md; 145 int retval; 146 147 if (regnum & MII_ADDR_C45) 148 return -EOPNOTSUPP; 149 150 md = ECM_MD_WRITE; 151 if (!adapter->suppress_preamble) 152 md |= ECM_MD_PREAMBLE; 153 md |= (regnum << ECM_MD_ADDR_SHIFT) & ECM_MD_ADDR_MASK; 154 md |= (addr << ECM_MD_PHY_ADDR_SHIFT) & ECM_MD_PHY_ADDR_MASK; 155 md |= ((u32)val << ECM_MD_DATA_SHIFT) & ECM_MD_DATA_MASK; 156 iowrite32(md, adapter->addr + ECM_MD_CONTROL); 157 retval = readl_poll_timeout_atomic(adapter->addr + ECM_MD_STATUS, md, 158 !(md & ECM_MD_BUSY), 16, 1000); 159 if (retval != 0) 160 return retval; 161 162 return 0; 163 } 164 165 static void tsnep_set_link_mode(struct tsnep_adapter *adapter) 166 { 167 u32 mode; 168 169 switch (adapter->phydev->speed) { 170 case SPEED_100: 171 mode = ECM_LINK_MODE_100; 172 break; 173 case SPEED_1000: 174 mode = ECM_LINK_MODE_1000; 175 break; 176 default: 177 mode = ECM_LINK_MODE_OFF; 178 break; 179 } 180 iowrite32(mode, adapter->addr + ECM_STATUS); 181 } 182 183 static void tsnep_phy_link_status_change(struct net_device *netdev) 184 { 185 struct tsnep_adapter *adapter = netdev_priv(netdev); 186 struct phy_device *phydev = netdev->phydev; 187 188 if (phydev->link) 189 tsnep_set_link_mode(adapter); 190 191 phy_print_status(netdev->phydev); 192 } 193 194 static int tsnep_phy_loopback(struct tsnep_adapter *adapter, bool enable) 195 { 196 int retval; 197 198 retval = phy_loopback(adapter->phydev, enable); 199 200 /* PHY link state change is not signaled if loopback is enabled, it 201 * would delay a working loopback anyway, let's ensure that loopback 202 * is working immediately by setting link mode directly 203 */ 204 if (!retval && enable) 205 tsnep_set_link_mode(adapter); 206 207 return retval; 208 } 209 210 static int tsnep_phy_open(struct tsnep_adapter *adapter) 211 { 212 struct phy_device *phydev; 213 struct ethtool_eee ethtool_eee; 214 int retval; 215 216 retval = phy_connect_direct(adapter->netdev, adapter->phydev, 217 tsnep_phy_link_status_change, 218 adapter->phy_mode); 219 if (retval) 220 return retval; 221 phydev = adapter->netdev->phydev; 222 223 /* MAC supports only 100Mbps|1000Mbps full duplex 224 * SPE (Single Pair Ethernet) is also an option but not implemented yet 225 */ 226 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT); 227 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Full_BIT); 228 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT); 229 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT); 230 231 /* disable EEE autoneg, EEE not supported by TSNEP */ 232 memset(ðtool_eee, 0, sizeof(ethtool_eee)); 233 phy_ethtool_set_eee(adapter->phydev, ðtool_eee); 234 235 adapter->phydev->irq = PHY_MAC_INTERRUPT; 236 phy_start(adapter->phydev); 237 238 return 0; 239 } 240 241 static void tsnep_phy_close(struct tsnep_adapter *adapter) 242 { 243 phy_stop(adapter->netdev->phydev); 244 phy_disconnect(adapter->netdev->phydev); 245 adapter->netdev->phydev = NULL; 246 } 247 248 static void tsnep_tx_ring_cleanup(struct tsnep_tx *tx) 249 { 250 struct device *dmadev = tx->adapter->dmadev; 251 int i; 252 253 memset(tx->entry, 0, sizeof(tx->entry)); 254 255 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 256 if (tx->page[i]) { 257 dma_free_coherent(dmadev, PAGE_SIZE, tx->page[i], 258 tx->page_dma[i]); 259 tx->page[i] = NULL; 260 tx->page_dma[i] = 0; 261 } 262 } 263 } 264 265 static int tsnep_tx_ring_init(struct tsnep_tx *tx) 266 { 267 struct device *dmadev = tx->adapter->dmadev; 268 struct tsnep_tx_entry *entry; 269 struct tsnep_tx_entry *next_entry; 270 int i, j; 271 int retval; 272 273 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 274 tx->page[i] = 275 dma_alloc_coherent(dmadev, PAGE_SIZE, &tx->page_dma[i], 276 GFP_KERNEL); 277 if (!tx->page[i]) { 278 retval = -ENOMEM; 279 goto alloc_failed; 280 } 281 for (j = 0; j < TSNEP_RING_ENTRIES_PER_PAGE; j++) { 282 entry = &tx->entry[TSNEP_RING_ENTRIES_PER_PAGE * i + j]; 283 entry->desc_wb = (struct tsnep_tx_desc_wb *) 284 (((u8 *)tx->page[i]) + TSNEP_DESC_SIZE * j); 285 entry->desc = (struct tsnep_tx_desc *) 286 (((u8 *)entry->desc_wb) + TSNEP_DESC_OFFSET); 287 entry->desc_dma = tx->page_dma[i] + TSNEP_DESC_SIZE * j; 288 } 289 } 290 for (i = 0; i < TSNEP_RING_SIZE; i++) { 291 entry = &tx->entry[i]; 292 next_entry = &tx->entry[(i + 1) % TSNEP_RING_SIZE]; 293 entry->desc->next = __cpu_to_le64(next_entry->desc_dma); 294 } 295 296 return 0; 297 298 alloc_failed: 299 tsnep_tx_ring_cleanup(tx); 300 return retval; 301 } 302 303 static void tsnep_tx_activate(struct tsnep_tx *tx, int index, int length, 304 bool last) 305 { 306 struct tsnep_tx_entry *entry = &tx->entry[index]; 307 308 entry->properties = 0; 309 if (entry->skb) { 310 entry->properties = length & TSNEP_DESC_LENGTH_MASK; 311 entry->properties |= TSNEP_DESC_INTERRUPT_FLAG; 312 if (skb_shinfo(entry->skb)->tx_flags & SKBTX_IN_PROGRESS) 313 entry->properties |= TSNEP_DESC_EXTENDED_WRITEBACK_FLAG; 314 315 /* toggle user flag to prevent false acknowledge 316 * 317 * Only the first fragment is acknowledged. For all other 318 * fragments no acknowledge is done and the last written owner 319 * counter stays in the writeback descriptor. Therefore, it is 320 * possible that the last written owner counter is identical to 321 * the new incremented owner counter and a false acknowledge is 322 * detected before the real acknowledge has been done by 323 * hardware. 324 * 325 * The user flag is used to prevent this situation. The user 326 * flag is copied to the writeback descriptor by the hardware 327 * and is used as additional acknowledge data. By toggeling the 328 * user flag only for the first fragment (which is 329 * acknowledged), it is guaranteed that the last acknowledge 330 * done for this descriptor has used a different user flag and 331 * cannot be detected as false acknowledge. 332 */ 333 entry->owner_user_flag = !entry->owner_user_flag; 334 } 335 if (last) 336 entry->properties |= TSNEP_TX_DESC_LAST_FRAGMENT_FLAG; 337 if (index == tx->increment_owner_counter) { 338 tx->owner_counter++; 339 if (tx->owner_counter == 4) 340 tx->owner_counter = 1; 341 tx->increment_owner_counter--; 342 if (tx->increment_owner_counter < 0) 343 tx->increment_owner_counter = TSNEP_RING_SIZE - 1; 344 } 345 entry->properties |= 346 (tx->owner_counter << TSNEP_DESC_OWNER_COUNTER_SHIFT) & 347 TSNEP_DESC_OWNER_COUNTER_MASK; 348 if (entry->owner_user_flag) 349 entry->properties |= TSNEP_TX_DESC_OWNER_USER_FLAG; 350 entry->desc->more_properties = 351 __cpu_to_le32(entry->len & TSNEP_DESC_LENGTH_MASK); 352 353 /* descriptor properties shall be written last, because valid data is 354 * signaled there 355 */ 356 dma_wmb(); 357 358 entry->desc->properties = __cpu_to_le32(entry->properties); 359 } 360 361 static int tsnep_tx_desc_available(struct tsnep_tx *tx) 362 { 363 if (tx->read <= tx->write) 364 return TSNEP_RING_SIZE - tx->write + tx->read - 1; 365 else 366 return tx->read - tx->write - 1; 367 } 368 369 static int tsnep_tx_map(struct sk_buff *skb, struct tsnep_tx *tx, int count) 370 { 371 struct device *dmadev = tx->adapter->dmadev; 372 struct tsnep_tx_entry *entry; 373 unsigned int len; 374 dma_addr_t dma; 375 int map_len = 0; 376 int i; 377 378 for (i = 0; i < count; i++) { 379 entry = &tx->entry[(tx->write + i) % TSNEP_RING_SIZE]; 380 381 if (i == 0) { 382 len = skb_headlen(skb); 383 dma = dma_map_single(dmadev, skb->data, len, 384 DMA_TO_DEVICE); 385 } else { 386 len = skb_frag_size(&skb_shinfo(skb)->frags[i - 1]); 387 dma = skb_frag_dma_map(dmadev, 388 &skb_shinfo(skb)->frags[i - 1], 389 0, len, DMA_TO_DEVICE); 390 } 391 if (dma_mapping_error(dmadev, dma)) 392 return -ENOMEM; 393 394 entry->len = len; 395 dma_unmap_addr_set(entry, dma, dma); 396 397 entry->desc->tx = __cpu_to_le64(dma); 398 399 map_len += len; 400 } 401 402 return map_len; 403 } 404 405 static int tsnep_tx_unmap(struct tsnep_tx *tx, int index, int count) 406 { 407 struct device *dmadev = tx->adapter->dmadev; 408 struct tsnep_tx_entry *entry; 409 int map_len = 0; 410 int i; 411 412 for (i = 0; i < count; i++) { 413 entry = &tx->entry[(index + i) % TSNEP_RING_SIZE]; 414 415 if (entry->len) { 416 if (i == 0) 417 dma_unmap_single(dmadev, 418 dma_unmap_addr(entry, dma), 419 dma_unmap_len(entry, len), 420 DMA_TO_DEVICE); 421 else 422 dma_unmap_page(dmadev, 423 dma_unmap_addr(entry, dma), 424 dma_unmap_len(entry, len), 425 DMA_TO_DEVICE); 426 map_len += entry->len; 427 entry->len = 0; 428 } 429 } 430 431 return map_len; 432 } 433 434 static netdev_tx_t tsnep_xmit_frame_ring(struct sk_buff *skb, 435 struct tsnep_tx *tx) 436 { 437 unsigned long flags; 438 int count = 1; 439 struct tsnep_tx_entry *entry; 440 int length; 441 int i; 442 int retval; 443 444 if (skb_shinfo(skb)->nr_frags > 0) 445 count += skb_shinfo(skb)->nr_frags; 446 447 spin_lock_irqsave(&tx->lock, flags); 448 449 if (tsnep_tx_desc_available(tx) < count) { 450 /* ring full, shall not happen because queue is stopped if full 451 * below 452 */ 453 netif_stop_queue(tx->adapter->netdev); 454 455 spin_unlock_irqrestore(&tx->lock, flags); 456 457 return NETDEV_TX_BUSY; 458 } 459 460 entry = &tx->entry[tx->write]; 461 entry->skb = skb; 462 463 retval = tsnep_tx_map(skb, tx, count); 464 if (retval < 0) { 465 tsnep_tx_unmap(tx, tx->write, count); 466 dev_kfree_skb_any(entry->skb); 467 entry->skb = NULL; 468 469 tx->dropped++; 470 471 spin_unlock_irqrestore(&tx->lock, flags); 472 473 netdev_err(tx->adapter->netdev, "TX DMA map failed\n"); 474 475 return NETDEV_TX_OK; 476 } 477 length = retval; 478 479 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) 480 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; 481 482 for (i = 0; i < count; i++) 483 tsnep_tx_activate(tx, (tx->write + i) % TSNEP_RING_SIZE, length, 484 i == (count - 1)); 485 tx->write = (tx->write + count) % TSNEP_RING_SIZE; 486 487 skb_tx_timestamp(skb); 488 489 /* descriptor properties shall be valid before hardware is notified */ 490 dma_wmb(); 491 492 iowrite32(TSNEP_CONTROL_TX_ENABLE, tx->addr + TSNEP_CONTROL); 493 494 if (tsnep_tx_desc_available(tx) < (MAX_SKB_FRAGS + 1)) { 495 /* ring can get full with next frame */ 496 netif_stop_queue(tx->adapter->netdev); 497 } 498 499 spin_unlock_irqrestore(&tx->lock, flags); 500 501 return NETDEV_TX_OK; 502 } 503 504 static bool tsnep_tx_poll(struct tsnep_tx *tx, int napi_budget) 505 { 506 unsigned long flags; 507 int budget = 128; 508 struct tsnep_tx_entry *entry; 509 int count; 510 int length; 511 512 spin_lock_irqsave(&tx->lock, flags); 513 514 do { 515 if (tx->read == tx->write) 516 break; 517 518 entry = &tx->entry[tx->read]; 519 if ((__le32_to_cpu(entry->desc_wb->properties) & 520 TSNEP_TX_DESC_OWNER_MASK) != 521 (entry->properties & TSNEP_TX_DESC_OWNER_MASK)) 522 break; 523 524 /* descriptor properties shall be read first, because valid data 525 * is signaled there 526 */ 527 dma_rmb(); 528 529 count = 1; 530 if (skb_shinfo(entry->skb)->nr_frags > 0) 531 count += skb_shinfo(entry->skb)->nr_frags; 532 533 length = tsnep_tx_unmap(tx, tx->read, count); 534 535 if ((skb_shinfo(entry->skb)->tx_flags & SKBTX_IN_PROGRESS) && 536 (__le32_to_cpu(entry->desc_wb->properties) & 537 TSNEP_DESC_EXTENDED_WRITEBACK_FLAG)) { 538 struct skb_shared_hwtstamps hwtstamps; 539 u64 timestamp; 540 541 if (skb_shinfo(entry->skb)->tx_flags & 542 SKBTX_HW_TSTAMP_USE_CYCLES) 543 timestamp = 544 __le64_to_cpu(entry->desc_wb->counter); 545 else 546 timestamp = 547 __le64_to_cpu(entry->desc_wb->timestamp); 548 549 memset(&hwtstamps, 0, sizeof(hwtstamps)); 550 hwtstamps.hwtstamp = ns_to_ktime(timestamp); 551 552 skb_tstamp_tx(entry->skb, &hwtstamps); 553 } 554 555 napi_consume_skb(entry->skb, budget); 556 entry->skb = NULL; 557 558 tx->read = (tx->read + count) % TSNEP_RING_SIZE; 559 560 tx->packets++; 561 tx->bytes += length + ETH_FCS_LEN; 562 563 budget--; 564 } while (likely(budget)); 565 566 if ((tsnep_tx_desc_available(tx) >= ((MAX_SKB_FRAGS + 1) * 2)) && 567 netif_queue_stopped(tx->adapter->netdev)) { 568 netif_wake_queue(tx->adapter->netdev); 569 } 570 571 spin_unlock_irqrestore(&tx->lock, flags); 572 573 return (budget != 0); 574 } 575 576 static bool tsnep_tx_pending(struct tsnep_tx *tx) 577 { 578 unsigned long flags; 579 struct tsnep_tx_entry *entry; 580 bool pending = false; 581 582 spin_lock_irqsave(&tx->lock, flags); 583 584 if (tx->read != tx->write) { 585 entry = &tx->entry[tx->read]; 586 if ((__le32_to_cpu(entry->desc_wb->properties) & 587 TSNEP_TX_DESC_OWNER_MASK) == 588 (entry->properties & TSNEP_TX_DESC_OWNER_MASK)) 589 pending = true; 590 } 591 592 spin_unlock_irqrestore(&tx->lock, flags); 593 594 return pending; 595 } 596 597 static int tsnep_tx_open(struct tsnep_adapter *adapter, void __iomem *addr, 598 int queue_index, struct tsnep_tx *tx) 599 { 600 dma_addr_t dma; 601 int retval; 602 603 memset(tx, 0, sizeof(*tx)); 604 tx->adapter = adapter; 605 tx->addr = addr; 606 tx->queue_index = queue_index; 607 608 retval = tsnep_tx_ring_init(tx); 609 if (retval) 610 return retval; 611 612 dma = tx->entry[0].desc_dma | TSNEP_RESET_OWNER_COUNTER; 613 iowrite32(DMA_ADDR_LOW(dma), tx->addr + TSNEP_TX_DESC_ADDR_LOW); 614 iowrite32(DMA_ADDR_HIGH(dma), tx->addr + TSNEP_TX_DESC_ADDR_HIGH); 615 tx->owner_counter = 1; 616 tx->increment_owner_counter = TSNEP_RING_SIZE - 1; 617 618 spin_lock_init(&tx->lock); 619 620 return 0; 621 } 622 623 static void tsnep_tx_close(struct tsnep_tx *tx) 624 { 625 u32 val; 626 627 readx_poll_timeout(ioread32, tx->addr + TSNEP_CONTROL, val, 628 ((val & TSNEP_CONTROL_TX_ENABLE) == 0), 10000, 629 1000000); 630 631 tsnep_tx_ring_cleanup(tx); 632 } 633 634 static void tsnep_rx_ring_cleanup(struct tsnep_rx *rx) 635 { 636 struct device *dmadev = rx->adapter->dmadev; 637 struct tsnep_rx_entry *entry; 638 int i; 639 640 for (i = 0; i < TSNEP_RING_SIZE; i++) { 641 entry = &rx->entry[i]; 642 if (entry->page) 643 page_pool_put_full_page(rx->page_pool, entry->page, 644 false); 645 entry->page = NULL; 646 } 647 648 if (rx->page_pool) 649 page_pool_destroy(rx->page_pool); 650 651 memset(rx->entry, 0, sizeof(rx->entry)); 652 653 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 654 if (rx->page[i]) { 655 dma_free_coherent(dmadev, PAGE_SIZE, rx->page[i], 656 rx->page_dma[i]); 657 rx->page[i] = NULL; 658 rx->page_dma[i] = 0; 659 } 660 } 661 } 662 663 static int tsnep_rx_ring_init(struct tsnep_rx *rx) 664 { 665 struct device *dmadev = rx->adapter->dmadev; 666 struct tsnep_rx_entry *entry; 667 struct page_pool_params pp_params = { 0 }; 668 struct tsnep_rx_entry *next_entry; 669 int i, j; 670 int retval; 671 672 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 673 rx->page[i] = 674 dma_alloc_coherent(dmadev, PAGE_SIZE, &rx->page_dma[i], 675 GFP_KERNEL); 676 if (!rx->page[i]) { 677 retval = -ENOMEM; 678 goto failed; 679 } 680 for (j = 0; j < TSNEP_RING_ENTRIES_PER_PAGE; j++) { 681 entry = &rx->entry[TSNEP_RING_ENTRIES_PER_PAGE * i + j]; 682 entry->desc_wb = (struct tsnep_rx_desc_wb *) 683 (((u8 *)rx->page[i]) + TSNEP_DESC_SIZE * j); 684 entry->desc = (struct tsnep_rx_desc *) 685 (((u8 *)entry->desc_wb) + TSNEP_DESC_OFFSET); 686 entry->desc_dma = rx->page_dma[i] + TSNEP_DESC_SIZE * j; 687 } 688 } 689 690 pp_params.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV; 691 pp_params.order = 0; 692 pp_params.pool_size = TSNEP_RING_SIZE; 693 pp_params.nid = dev_to_node(dmadev); 694 pp_params.dev = dmadev; 695 pp_params.dma_dir = DMA_FROM_DEVICE; 696 pp_params.max_len = TSNEP_MAX_RX_BUF_SIZE; 697 pp_params.offset = TSNEP_SKB_PAD; 698 rx->page_pool = page_pool_create(&pp_params); 699 if (IS_ERR(rx->page_pool)) { 700 retval = PTR_ERR(rx->page_pool); 701 rx->page_pool = NULL; 702 goto failed; 703 } 704 705 for (i = 0; i < TSNEP_RING_SIZE; i++) { 706 entry = &rx->entry[i]; 707 next_entry = &rx->entry[(i + 1) % TSNEP_RING_SIZE]; 708 entry->desc->next = __cpu_to_le64(next_entry->desc_dma); 709 } 710 711 return 0; 712 713 failed: 714 tsnep_rx_ring_cleanup(rx); 715 return retval; 716 } 717 718 static int tsnep_rx_desc_available(struct tsnep_rx *rx) 719 { 720 if (rx->read <= rx->write) 721 return TSNEP_RING_SIZE - rx->write + rx->read - 1; 722 else 723 return rx->read - rx->write - 1; 724 } 725 726 static void tsnep_rx_set_page(struct tsnep_rx *rx, struct tsnep_rx_entry *entry, 727 struct page *page) 728 { 729 entry->page = page; 730 entry->len = TSNEP_MAX_RX_BUF_SIZE; 731 entry->dma = page_pool_get_dma_addr(entry->page); 732 entry->desc->rx = __cpu_to_le64(entry->dma + TSNEP_SKB_PAD); 733 } 734 735 static int tsnep_rx_alloc_buffer(struct tsnep_rx *rx, int index) 736 { 737 struct tsnep_rx_entry *entry = &rx->entry[index]; 738 struct page *page; 739 740 page = page_pool_dev_alloc_pages(rx->page_pool); 741 if (unlikely(!page)) 742 return -ENOMEM; 743 tsnep_rx_set_page(rx, entry, page); 744 745 return 0; 746 } 747 748 static void tsnep_rx_reuse_buffer(struct tsnep_rx *rx, int index) 749 { 750 struct tsnep_rx_entry *entry = &rx->entry[index]; 751 struct tsnep_rx_entry *read = &rx->entry[rx->read]; 752 753 tsnep_rx_set_page(rx, entry, read->page); 754 read->page = NULL; 755 } 756 757 static void tsnep_rx_activate(struct tsnep_rx *rx, int index) 758 { 759 struct tsnep_rx_entry *entry = &rx->entry[index]; 760 761 /* TSNEP_MAX_RX_BUF_SIZE is a multiple of 4 */ 762 entry->properties = entry->len & TSNEP_DESC_LENGTH_MASK; 763 entry->properties |= TSNEP_DESC_INTERRUPT_FLAG; 764 if (index == rx->increment_owner_counter) { 765 rx->owner_counter++; 766 if (rx->owner_counter == 4) 767 rx->owner_counter = 1; 768 rx->increment_owner_counter--; 769 if (rx->increment_owner_counter < 0) 770 rx->increment_owner_counter = TSNEP_RING_SIZE - 1; 771 } 772 entry->properties |= 773 (rx->owner_counter << TSNEP_DESC_OWNER_COUNTER_SHIFT) & 774 TSNEP_DESC_OWNER_COUNTER_MASK; 775 776 /* descriptor properties shall be written last, because valid data is 777 * signaled there 778 */ 779 dma_wmb(); 780 781 entry->desc->properties = __cpu_to_le32(entry->properties); 782 } 783 784 static int tsnep_rx_refill(struct tsnep_rx *rx, int count, bool reuse) 785 { 786 int index; 787 bool alloc_failed = false; 788 bool enable = false; 789 int i; 790 int retval; 791 792 for (i = 0; i < count && !alloc_failed; i++) { 793 index = (rx->write + i) % TSNEP_RING_SIZE; 794 795 retval = tsnep_rx_alloc_buffer(rx, index); 796 if (unlikely(retval)) { 797 rx->alloc_failed++; 798 alloc_failed = true; 799 800 /* reuse only if no other allocation was successful */ 801 if (i == 0 && reuse) 802 tsnep_rx_reuse_buffer(rx, index); 803 else 804 break; 805 } 806 807 tsnep_rx_activate(rx, index); 808 809 enable = true; 810 } 811 812 if (enable) { 813 rx->write = (rx->write + i) % TSNEP_RING_SIZE; 814 815 /* descriptor properties shall be valid before hardware is 816 * notified 817 */ 818 dma_wmb(); 819 820 iowrite32(TSNEP_CONTROL_RX_ENABLE, rx->addr + TSNEP_CONTROL); 821 } 822 823 return i; 824 } 825 826 static struct sk_buff *tsnep_build_skb(struct tsnep_rx *rx, struct page *page, 827 int length) 828 { 829 struct sk_buff *skb; 830 831 skb = napi_build_skb(page_address(page), PAGE_SIZE); 832 if (unlikely(!skb)) 833 return NULL; 834 835 /* update pointers within the skb to store the data */ 836 skb_reserve(skb, TSNEP_SKB_PAD + TSNEP_RX_INLINE_METADATA_SIZE); 837 __skb_put(skb, length - TSNEP_RX_INLINE_METADATA_SIZE - ETH_FCS_LEN); 838 839 if (rx->adapter->hwtstamp_config.rx_filter == HWTSTAMP_FILTER_ALL) { 840 struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); 841 struct tsnep_rx_inline *rx_inline = 842 (struct tsnep_rx_inline *)(page_address(page) + 843 TSNEP_SKB_PAD); 844 845 skb_shinfo(skb)->tx_flags |= 846 SKBTX_HW_TSTAMP_NETDEV; 847 memset(hwtstamps, 0, sizeof(*hwtstamps)); 848 hwtstamps->netdev_data = rx_inline; 849 } 850 851 skb_record_rx_queue(skb, rx->queue_index); 852 skb->protocol = eth_type_trans(skb, rx->adapter->netdev); 853 854 return skb; 855 } 856 857 static int tsnep_rx_poll(struct tsnep_rx *rx, struct napi_struct *napi, 858 int budget) 859 { 860 struct device *dmadev = rx->adapter->dmadev; 861 int desc_available; 862 int done = 0; 863 enum dma_data_direction dma_dir; 864 struct tsnep_rx_entry *entry; 865 struct sk_buff *skb; 866 int length; 867 868 desc_available = tsnep_rx_desc_available(rx); 869 dma_dir = page_pool_get_dma_dir(rx->page_pool); 870 871 while (likely(done < budget) && (rx->read != rx->write)) { 872 entry = &rx->entry[rx->read]; 873 if ((__le32_to_cpu(entry->desc_wb->properties) & 874 TSNEP_DESC_OWNER_COUNTER_MASK) != 875 (entry->properties & TSNEP_DESC_OWNER_COUNTER_MASK)) 876 break; 877 done++; 878 879 if (desc_available >= TSNEP_RING_RX_REFILL) { 880 bool reuse = desc_available >= TSNEP_RING_RX_REUSE; 881 882 desc_available -= tsnep_rx_refill(rx, desc_available, 883 reuse); 884 if (!entry->page) { 885 /* buffer has been reused for refill to prevent 886 * empty RX ring, thus buffer cannot be used for 887 * RX processing 888 */ 889 rx->read = (rx->read + 1) % TSNEP_RING_SIZE; 890 desc_available++; 891 892 rx->dropped++; 893 894 continue; 895 } 896 } 897 898 /* descriptor properties shall be read first, because valid data 899 * is signaled there 900 */ 901 dma_rmb(); 902 903 prefetch(page_address(entry->page) + TSNEP_SKB_PAD); 904 length = __le32_to_cpu(entry->desc_wb->properties) & 905 TSNEP_DESC_LENGTH_MASK; 906 dma_sync_single_range_for_cpu(dmadev, entry->dma, TSNEP_SKB_PAD, 907 length, dma_dir); 908 909 rx->read = (rx->read + 1) % TSNEP_RING_SIZE; 910 desc_available++; 911 912 skb = tsnep_build_skb(rx, entry->page, length); 913 if (skb) { 914 page_pool_release_page(rx->page_pool, entry->page); 915 916 rx->packets++; 917 rx->bytes += length - TSNEP_RX_INLINE_METADATA_SIZE; 918 if (skb->pkt_type == PACKET_MULTICAST) 919 rx->multicast++; 920 921 napi_gro_receive(napi, skb); 922 } else { 923 page_pool_recycle_direct(rx->page_pool, entry->page); 924 925 rx->dropped++; 926 } 927 entry->page = NULL; 928 } 929 930 if (desc_available) 931 tsnep_rx_refill(rx, desc_available, false); 932 933 return done; 934 } 935 936 static bool tsnep_rx_pending(struct tsnep_rx *rx) 937 { 938 struct tsnep_rx_entry *entry; 939 940 if (rx->read != rx->write) { 941 entry = &rx->entry[rx->read]; 942 if ((__le32_to_cpu(entry->desc_wb->properties) & 943 TSNEP_DESC_OWNER_COUNTER_MASK) == 944 (entry->properties & TSNEP_DESC_OWNER_COUNTER_MASK)) 945 return true; 946 } 947 948 return false; 949 } 950 951 static int tsnep_rx_open(struct tsnep_adapter *adapter, void __iomem *addr, 952 int queue_index, struct tsnep_rx *rx) 953 { 954 dma_addr_t dma; 955 int retval; 956 957 memset(rx, 0, sizeof(*rx)); 958 rx->adapter = adapter; 959 rx->addr = addr; 960 rx->queue_index = queue_index; 961 962 retval = tsnep_rx_ring_init(rx); 963 if (retval) 964 return retval; 965 966 dma = rx->entry[0].desc_dma | TSNEP_RESET_OWNER_COUNTER; 967 iowrite32(DMA_ADDR_LOW(dma), rx->addr + TSNEP_RX_DESC_ADDR_LOW); 968 iowrite32(DMA_ADDR_HIGH(dma), rx->addr + TSNEP_RX_DESC_ADDR_HIGH); 969 rx->owner_counter = 1; 970 rx->increment_owner_counter = TSNEP_RING_SIZE - 1; 971 972 tsnep_rx_refill(rx, tsnep_rx_desc_available(rx), false); 973 974 return 0; 975 } 976 977 static void tsnep_rx_close(struct tsnep_rx *rx) 978 { 979 u32 val; 980 981 iowrite32(TSNEP_CONTROL_RX_DISABLE, rx->addr + TSNEP_CONTROL); 982 readx_poll_timeout(ioread32, rx->addr + TSNEP_CONTROL, val, 983 ((val & TSNEP_CONTROL_RX_ENABLE) == 0), 10000, 984 1000000); 985 986 tsnep_rx_ring_cleanup(rx); 987 } 988 989 static bool tsnep_pending(struct tsnep_queue *queue) 990 { 991 if (queue->tx && tsnep_tx_pending(queue->tx)) 992 return true; 993 994 if (queue->rx && tsnep_rx_pending(queue->rx)) 995 return true; 996 997 return false; 998 } 999 1000 static int tsnep_poll(struct napi_struct *napi, int budget) 1001 { 1002 struct tsnep_queue *queue = container_of(napi, struct tsnep_queue, 1003 napi); 1004 bool complete = true; 1005 int done = 0; 1006 1007 if (queue->tx) 1008 complete = tsnep_tx_poll(queue->tx, budget); 1009 1010 if (queue->rx) { 1011 done = tsnep_rx_poll(queue->rx, napi, budget); 1012 if (done >= budget) 1013 complete = false; 1014 } 1015 1016 /* if all work not completed, return budget and keep polling */ 1017 if (!complete) 1018 return budget; 1019 1020 if (likely(napi_complete_done(napi, done))) { 1021 tsnep_enable_irq(queue->adapter, queue->irq_mask); 1022 1023 /* reschedule if work is already pending, prevent rotten packets 1024 * which are transmitted or received after polling but before 1025 * interrupt enable 1026 */ 1027 if (tsnep_pending(queue)) { 1028 tsnep_disable_irq(queue->adapter, queue->irq_mask); 1029 napi_schedule(napi); 1030 } 1031 } 1032 1033 return min(done, budget - 1); 1034 } 1035 1036 static int tsnep_request_irq(struct tsnep_queue *queue, bool first) 1037 { 1038 const char *name = netdev_name(queue->adapter->netdev); 1039 irq_handler_t handler; 1040 void *dev; 1041 int retval; 1042 1043 if (first) { 1044 sprintf(queue->name, "%s-mac", name); 1045 handler = tsnep_irq; 1046 dev = queue->adapter; 1047 } else { 1048 if (queue->tx && queue->rx) 1049 sprintf(queue->name, "%s-txrx-%d", name, 1050 queue->rx->queue_index); 1051 else if (queue->tx) 1052 sprintf(queue->name, "%s-tx-%d", name, 1053 queue->tx->queue_index); 1054 else 1055 sprintf(queue->name, "%s-rx-%d", name, 1056 queue->rx->queue_index); 1057 handler = tsnep_irq_txrx; 1058 dev = queue; 1059 } 1060 1061 retval = request_irq(queue->irq, handler, 0, queue->name, dev); 1062 if (retval) { 1063 /* if name is empty, then interrupt won't be freed */ 1064 memset(queue->name, 0, sizeof(queue->name)); 1065 } 1066 1067 return retval; 1068 } 1069 1070 static void tsnep_free_irq(struct tsnep_queue *queue, bool first) 1071 { 1072 void *dev; 1073 1074 if (!strlen(queue->name)) 1075 return; 1076 1077 if (first) 1078 dev = queue->adapter; 1079 else 1080 dev = queue; 1081 1082 free_irq(queue->irq, dev); 1083 memset(queue->name, 0, sizeof(queue->name)); 1084 } 1085 1086 static int tsnep_netdev_open(struct net_device *netdev) 1087 { 1088 struct tsnep_adapter *adapter = netdev_priv(netdev); 1089 int i; 1090 void __iomem *addr; 1091 int tx_queue_index = 0; 1092 int rx_queue_index = 0; 1093 int retval; 1094 1095 for (i = 0; i < adapter->num_queues; i++) { 1096 adapter->queue[i].adapter = adapter; 1097 if (adapter->queue[i].tx) { 1098 addr = adapter->addr + TSNEP_QUEUE(tx_queue_index); 1099 retval = tsnep_tx_open(adapter, addr, tx_queue_index, 1100 adapter->queue[i].tx); 1101 if (retval) 1102 goto failed; 1103 tx_queue_index++; 1104 } 1105 if (adapter->queue[i].rx) { 1106 addr = adapter->addr + TSNEP_QUEUE(rx_queue_index); 1107 retval = tsnep_rx_open(adapter, addr, 1108 rx_queue_index, 1109 adapter->queue[i].rx); 1110 if (retval) 1111 goto failed; 1112 rx_queue_index++; 1113 } 1114 1115 retval = tsnep_request_irq(&adapter->queue[i], i == 0); 1116 if (retval) { 1117 netif_err(adapter, drv, adapter->netdev, 1118 "can't get assigned irq %d.\n", 1119 adapter->queue[i].irq); 1120 goto failed; 1121 } 1122 } 1123 1124 retval = netif_set_real_num_tx_queues(adapter->netdev, 1125 adapter->num_tx_queues); 1126 if (retval) 1127 goto failed; 1128 retval = netif_set_real_num_rx_queues(adapter->netdev, 1129 adapter->num_rx_queues); 1130 if (retval) 1131 goto failed; 1132 1133 tsnep_enable_irq(adapter, ECM_INT_LINK); 1134 retval = tsnep_phy_open(adapter); 1135 if (retval) 1136 goto phy_failed; 1137 1138 for (i = 0; i < adapter->num_queues; i++) { 1139 netif_napi_add(adapter->netdev, &adapter->queue[i].napi, 1140 tsnep_poll); 1141 napi_enable(&adapter->queue[i].napi); 1142 1143 tsnep_enable_irq(adapter, adapter->queue[i].irq_mask); 1144 } 1145 1146 return 0; 1147 1148 phy_failed: 1149 tsnep_disable_irq(adapter, ECM_INT_LINK); 1150 tsnep_phy_close(adapter); 1151 failed: 1152 for (i = 0; i < adapter->num_queues; i++) { 1153 tsnep_free_irq(&adapter->queue[i], i == 0); 1154 1155 if (adapter->queue[i].rx) 1156 tsnep_rx_close(adapter->queue[i].rx); 1157 if (adapter->queue[i].tx) 1158 tsnep_tx_close(adapter->queue[i].tx); 1159 } 1160 return retval; 1161 } 1162 1163 static int tsnep_netdev_close(struct net_device *netdev) 1164 { 1165 struct tsnep_adapter *adapter = netdev_priv(netdev); 1166 int i; 1167 1168 tsnep_disable_irq(adapter, ECM_INT_LINK); 1169 tsnep_phy_close(adapter); 1170 1171 for (i = 0; i < adapter->num_queues; i++) { 1172 tsnep_disable_irq(adapter, adapter->queue[i].irq_mask); 1173 1174 napi_disable(&adapter->queue[i].napi); 1175 netif_napi_del(&adapter->queue[i].napi); 1176 1177 tsnep_free_irq(&adapter->queue[i], i == 0); 1178 1179 if (adapter->queue[i].rx) 1180 tsnep_rx_close(adapter->queue[i].rx); 1181 if (adapter->queue[i].tx) 1182 tsnep_tx_close(adapter->queue[i].tx); 1183 } 1184 1185 return 0; 1186 } 1187 1188 static netdev_tx_t tsnep_netdev_xmit_frame(struct sk_buff *skb, 1189 struct net_device *netdev) 1190 { 1191 struct tsnep_adapter *adapter = netdev_priv(netdev); 1192 u16 queue_mapping = skb_get_queue_mapping(skb); 1193 1194 if (queue_mapping >= adapter->num_tx_queues) 1195 queue_mapping = 0; 1196 1197 return tsnep_xmit_frame_ring(skb, &adapter->tx[queue_mapping]); 1198 } 1199 1200 static int tsnep_netdev_ioctl(struct net_device *netdev, struct ifreq *ifr, 1201 int cmd) 1202 { 1203 if (!netif_running(netdev)) 1204 return -EINVAL; 1205 if (cmd == SIOCSHWTSTAMP || cmd == SIOCGHWTSTAMP) 1206 return tsnep_ptp_ioctl(netdev, ifr, cmd); 1207 return phy_mii_ioctl(netdev->phydev, ifr, cmd); 1208 } 1209 1210 static void tsnep_netdev_set_multicast(struct net_device *netdev) 1211 { 1212 struct tsnep_adapter *adapter = netdev_priv(netdev); 1213 1214 u16 rx_filter = 0; 1215 1216 /* configured MAC address and broadcasts are never filtered */ 1217 if (netdev->flags & IFF_PROMISC) { 1218 rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS; 1219 rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_UNICASTS; 1220 } else if (!netdev_mc_empty(netdev) || (netdev->flags & IFF_ALLMULTI)) { 1221 rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS; 1222 } 1223 iowrite16(rx_filter, adapter->addr + TSNEP_RX_FILTER); 1224 } 1225 1226 static void tsnep_netdev_get_stats64(struct net_device *netdev, 1227 struct rtnl_link_stats64 *stats) 1228 { 1229 struct tsnep_adapter *adapter = netdev_priv(netdev); 1230 u32 reg; 1231 u32 val; 1232 int i; 1233 1234 for (i = 0; i < adapter->num_tx_queues; i++) { 1235 stats->tx_packets += adapter->tx[i].packets; 1236 stats->tx_bytes += adapter->tx[i].bytes; 1237 stats->tx_dropped += adapter->tx[i].dropped; 1238 } 1239 for (i = 0; i < adapter->num_rx_queues; i++) { 1240 stats->rx_packets += adapter->rx[i].packets; 1241 stats->rx_bytes += adapter->rx[i].bytes; 1242 stats->rx_dropped += adapter->rx[i].dropped; 1243 stats->multicast += adapter->rx[i].multicast; 1244 1245 reg = ioread32(adapter->addr + TSNEP_QUEUE(i) + 1246 TSNEP_RX_STATISTIC); 1247 val = (reg & TSNEP_RX_STATISTIC_NO_DESC_MASK) >> 1248 TSNEP_RX_STATISTIC_NO_DESC_SHIFT; 1249 stats->rx_dropped += val; 1250 val = (reg & TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_MASK) >> 1251 TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_SHIFT; 1252 stats->rx_dropped += val; 1253 val = (reg & TSNEP_RX_STATISTIC_FIFO_OVERFLOW_MASK) >> 1254 TSNEP_RX_STATISTIC_FIFO_OVERFLOW_SHIFT; 1255 stats->rx_errors += val; 1256 stats->rx_fifo_errors += val; 1257 val = (reg & TSNEP_RX_STATISTIC_INVALID_FRAME_MASK) >> 1258 TSNEP_RX_STATISTIC_INVALID_FRAME_SHIFT; 1259 stats->rx_errors += val; 1260 stats->rx_frame_errors += val; 1261 } 1262 1263 reg = ioread32(adapter->addr + ECM_STAT); 1264 val = (reg & ECM_STAT_RX_ERR_MASK) >> ECM_STAT_RX_ERR_SHIFT; 1265 stats->rx_errors += val; 1266 val = (reg & ECM_STAT_INV_FRM_MASK) >> ECM_STAT_INV_FRM_SHIFT; 1267 stats->rx_errors += val; 1268 stats->rx_crc_errors += val; 1269 val = (reg & ECM_STAT_FWD_RX_ERR_MASK) >> ECM_STAT_FWD_RX_ERR_SHIFT; 1270 stats->rx_errors += val; 1271 } 1272 1273 static void tsnep_mac_set_address(struct tsnep_adapter *adapter, u8 *addr) 1274 { 1275 iowrite32(*(u32 *)addr, adapter->addr + TSNEP_MAC_ADDRESS_LOW); 1276 iowrite16(*(u16 *)(addr + sizeof(u32)), 1277 adapter->addr + TSNEP_MAC_ADDRESS_HIGH); 1278 1279 ether_addr_copy(adapter->mac_address, addr); 1280 netif_info(adapter, drv, adapter->netdev, "MAC address set to %pM\n", 1281 addr); 1282 } 1283 1284 static int tsnep_netdev_set_mac_address(struct net_device *netdev, void *addr) 1285 { 1286 struct tsnep_adapter *adapter = netdev_priv(netdev); 1287 struct sockaddr *sock_addr = addr; 1288 int retval; 1289 1290 retval = eth_prepare_mac_addr_change(netdev, sock_addr); 1291 if (retval) 1292 return retval; 1293 eth_hw_addr_set(netdev, sock_addr->sa_data); 1294 tsnep_mac_set_address(adapter, sock_addr->sa_data); 1295 1296 return 0; 1297 } 1298 1299 static int tsnep_netdev_set_features(struct net_device *netdev, 1300 netdev_features_t features) 1301 { 1302 struct tsnep_adapter *adapter = netdev_priv(netdev); 1303 netdev_features_t changed = netdev->features ^ features; 1304 bool enable; 1305 int retval = 0; 1306 1307 if (changed & NETIF_F_LOOPBACK) { 1308 enable = !!(features & NETIF_F_LOOPBACK); 1309 retval = tsnep_phy_loopback(adapter, enable); 1310 } 1311 1312 return retval; 1313 } 1314 1315 static ktime_t tsnep_netdev_get_tstamp(struct net_device *netdev, 1316 const struct skb_shared_hwtstamps *hwtstamps, 1317 bool cycles) 1318 { 1319 struct tsnep_rx_inline *rx_inline = hwtstamps->netdev_data; 1320 u64 timestamp; 1321 1322 if (cycles) 1323 timestamp = __le64_to_cpu(rx_inline->counter); 1324 else 1325 timestamp = __le64_to_cpu(rx_inline->timestamp); 1326 1327 return ns_to_ktime(timestamp); 1328 } 1329 1330 static const struct net_device_ops tsnep_netdev_ops = { 1331 .ndo_open = tsnep_netdev_open, 1332 .ndo_stop = tsnep_netdev_close, 1333 .ndo_start_xmit = tsnep_netdev_xmit_frame, 1334 .ndo_eth_ioctl = tsnep_netdev_ioctl, 1335 .ndo_set_rx_mode = tsnep_netdev_set_multicast, 1336 .ndo_get_stats64 = tsnep_netdev_get_stats64, 1337 .ndo_set_mac_address = tsnep_netdev_set_mac_address, 1338 .ndo_set_features = tsnep_netdev_set_features, 1339 .ndo_get_tstamp = tsnep_netdev_get_tstamp, 1340 .ndo_setup_tc = tsnep_tc_setup, 1341 }; 1342 1343 static int tsnep_mac_init(struct tsnep_adapter *adapter) 1344 { 1345 int retval; 1346 1347 /* initialize RX filtering, at least configured MAC address and 1348 * broadcast are not filtered 1349 */ 1350 iowrite16(0, adapter->addr + TSNEP_RX_FILTER); 1351 1352 /* try to get MAC address in the following order: 1353 * - device tree 1354 * - valid MAC address already set 1355 * - MAC address register if valid 1356 * - random MAC address 1357 */ 1358 retval = of_get_mac_address(adapter->pdev->dev.of_node, 1359 adapter->mac_address); 1360 if (retval == -EPROBE_DEFER) 1361 return retval; 1362 if (retval && !is_valid_ether_addr(adapter->mac_address)) { 1363 *(u32 *)adapter->mac_address = 1364 ioread32(adapter->addr + TSNEP_MAC_ADDRESS_LOW); 1365 *(u16 *)(adapter->mac_address + sizeof(u32)) = 1366 ioread16(adapter->addr + TSNEP_MAC_ADDRESS_HIGH); 1367 if (!is_valid_ether_addr(adapter->mac_address)) 1368 eth_random_addr(adapter->mac_address); 1369 } 1370 1371 tsnep_mac_set_address(adapter, adapter->mac_address); 1372 eth_hw_addr_set(adapter->netdev, adapter->mac_address); 1373 1374 return 0; 1375 } 1376 1377 static int tsnep_mdio_init(struct tsnep_adapter *adapter) 1378 { 1379 struct device_node *np = adapter->pdev->dev.of_node; 1380 int retval; 1381 1382 if (np) { 1383 np = of_get_child_by_name(np, "mdio"); 1384 if (!np) 1385 return 0; 1386 1387 adapter->suppress_preamble = 1388 of_property_read_bool(np, "suppress-preamble"); 1389 } 1390 1391 adapter->mdiobus = devm_mdiobus_alloc(&adapter->pdev->dev); 1392 if (!adapter->mdiobus) { 1393 retval = -ENOMEM; 1394 1395 goto out; 1396 } 1397 1398 adapter->mdiobus->priv = (void *)adapter; 1399 adapter->mdiobus->parent = &adapter->pdev->dev; 1400 adapter->mdiobus->read = tsnep_mdiobus_read; 1401 adapter->mdiobus->write = tsnep_mdiobus_write; 1402 adapter->mdiobus->name = TSNEP "-mdiobus"; 1403 snprintf(adapter->mdiobus->id, MII_BUS_ID_SIZE, "%s", 1404 adapter->pdev->name); 1405 1406 /* do not scan broadcast address */ 1407 adapter->mdiobus->phy_mask = 0x0000001; 1408 1409 retval = of_mdiobus_register(adapter->mdiobus, np); 1410 1411 out: 1412 of_node_put(np); 1413 1414 return retval; 1415 } 1416 1417 static int tsnep_phy_init(struct tsnep_adapter *adapter) 1418 { 1419 struct device_node *phy_node; 1420 int retval; 1421 1422 retval = of_get_phy_mode(adapter->pdev->dev.of_node, 1423 &adapter->phy_mode); 1424 if (retval) 1425 adapter->phy_mode = PHY_INTERFACE_MODE_GMII; 1426 1427 phy_node = of_parse_phandle(adapter->pdev->dev.of_node, "phy-handle", 1428 0); 1429 adapter->phydev = of_phy_find_device(phy_node); 1430 of_node_put(phy_node); 1431 if (!adapter->phydev && adapter->mdiobus) 1432 adapter->phydev = phy_find_first(adapter->mdiobus); 1433 if (!adapter->phydev) 1434 return -EIO; 1435 1436 return 0; 1437 } 1438 1439 static int tsnep_queue_init(struct tsnep_adapter *adapter, int queue_count) 1440 { 1441 u32 irq_mask = ECM_INT_TX_0 | ECM_INT_RX_0; 1442 char name[8]; 1443 int i; 1444 int retval; 1445 1446 /* one TX/RX queue pair for netdev is mandatory */ 1447 if (platform_irq_count(adapter->pdev) == 1) 1448 retval = platform_get_irq(adapter->pdev, 0); 1449 else 1450 retval = platform_get_irq_byname(adapter->pdev, "mac"); 1451 if (retval < 0) 1452 return retval; 1453 adapter->num_tx_queues = 1; 1454 adapter->num_rx_queues = 1; 1455 adapter->num_queues = 1; 1456 adapter->queue[0].irq = retval; 1457 adapter->queue[0].tx = &adapter->tx[0]; 1458 adapter->queue[0].rx = &adapter->rx[0]; 1459 adapter->queue[0].irq_mask = irq_mask; 1460 adapter->queue[0].irq_delay_addr = adapter->addr + ECM_INT_DELAY; 1461 retval = tsnep_set_irq_coalesce(&adapter->queue[0], 1462 TSNEP_COALESCE_USECS_DEFAULT); 1463 if (retval < 0) 1464 return retval; 1465 1466 adapter->netdev->irq = adapter->queue[0].irq; 1467 1468 /* add additional TX/RX queue pairs only if dedicated interrupt is 1469 * available 1470 */ 1471 for (i = 1; i < queue_count; i++) { 1472 sprintf(name, "txrx-%d", i); 1473 retval = platform_get_irq_byname_optional(adapter->pdev, name); 1474 if (retval < 0) 1475 break; 1476 1477 adapter->num_tx_queues++; 1478 adapter->num_rx_queues++; 1479 adapter->num_queues++; 1480 adapter->queue[i].irq = retval; 1481 adapter->queue[i].tx = &adapter->tx[i]; 1482 adapter->queue[i].rx = &adapter->rx[i]; 1483 adapter->queue[i].irq_mask = 1484 irq_mask << (ECM_INT_TXRX_SHIFT * i); 1485 adapter->queue[i].irq_delay_addr = 1486 adapter->addr + ECM_INT_DELAY + ECM_INT_DELAY_OFFSET * i; 1487 retval = tsnep_set_irq_coalesce(&adapter->queue[i], 1488 TSNEP_COALESCE_USECS_DEFAULT); 1489 if (retval < 0) 1490 return retval; 1491 } 1492 1493 return 0; 1494 } 1495 1496 static int tsnep_probe(struct platform_device *pdev) 1497 { 1498 struct tsnep_adapter *adapter; 1499 struct net_device *netdev; 1500 struct resource *io; 1501 u32 type; 1502 int revision; 1503 int version; 1504 int queue_count; 1505 int retval; 1506 1507 netdev = devm_alloc_etherdev_mqs(&pdev->dev, 1508 sizeof(struct tsnep_adapter), 1509 TSNEP_MAX_QUEUES, TSNEP_MAX_QUEUES); 1510 if (!netdev) 1511 return -ENODEV; 1512 SET_NETDEV_DEV(netdev, &pdev->dev); 1513 adapter = netdev_priv(netdev); 1514 platform_set_drvdata(pdev, adapter); 1515 adapter->pdev = pdev; 1516 adapter->dmadev = &pdev->dev; 1517 adapter->netdev = netdev; 1518 adapter->msg_enable = NETIF_MSG_DRV | NETIF_MSG_PROBE | 1519 NETIF_MSG_LINK | NETIF_MSG_IFUP | 1520 NETIF_MSG_IFDOWN | NETIF_MSG_TX_QUEUED; 1521 1522 netdev->min_mtu = ETH_MIN_MTU; 1523 netdev->max_mtu = TSNEP_MAX_FRAME_SIZE; 1524 1525 mutex_init(&adapter->gate_control_lock); 1526 mutex_init(&adapter->rxnfc_lock); 1527 INIT_LIST_HEAD(&adapter->rxnfc_rules); 1528 1529 io = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1530 adapter->addr = devm_ioremap_resource(&pdev->dev, io); 1531 if (IS_ERR(adapter->addr)) 1532 return PTR_ERR(adapter->addr); 1533 netdev->mem_start = io->start; 1534 netdev->mem_end = io->end; 1535 1536 type = ioread32(adapter->addr + ECM_TYPE); 1537 revision = (type & ECM_REVISION_MASK) >> ECM_REVISION_SHIFT; 1538 version = (type & ECM_VERSION_MASK) >> ECM_VERSION_SHIFT; 1539 queue_count = (type & ECM_QUEUE_COUNT_MASK) >> ECM_QUEUE_COUNT_SHIFT; 1540 adapter->gate_control = type & ECM_GATE_CONTROL; 1541 adapter->rxnfc_max = TSNEP_RX_ASSIGN_ETHER_TYPE_COUNT; 1542 1543 tsnep_disable_irq(adapter, ECM_INT_ALL); 1544 1545 retval = tsnep_queue_init(adapter, queue_count); 1546 if (retval) 1547 return retval; 1548 1549 retval = dma_set_mask_and_coherent(&adapter->pdev->dev, 1550 DMA_BIT_MASK(64)); 1551 if (retval) { 1552 dev_err(&adapter->pdev->dev, "no usable DMA configuration.\n"); 1553 return retval; 1554 } 1555 1556 retval = tsnep_mac_init(adapter); 1557 if (retval) 1558 return retval; 1559 1560 retval = tsnep_mdio_init(adapter); 1561 if (retval) 1562 goto mdio_init_failed; 1563 1564 retval = tsnep_phy_init(adapter); 1565 if (retval) 1566 goto phy_init_failed; 1567 1568 retval = tsnep_ptp_init(adapter); 1569 if (retval) 1570 goto ptp_init_failed; 1571 1572 retval = tsnep_tc_init(adapter); 1573 if (retval) 1574 goto tc_init_failed; 1575 1576 retval = tsnep_rxnfc_init(adapter); 1577 if (retval) 1578 goto rxnfc_init_failed; 1579 1580 netdev->netdev_ops = &tsnep_netdev_ops; 1581 netdev->ethtool_ops = &tsnep_ethtool_ops; 1582 netdev->features = NETIF_F_SG; 1583 netdev->hw_features = netdev->features | NETIF_F_LOOPBACK; 1584 1585 /* carrier off reporting is important to ethtool even BEFORE open */ 1586 netif_carrier_off(netdev); 1587 1588 retval = register_netdev(netdev); 1589 if (retval) 1590 goto register_failed; 1591 1592 dev_info(&adapter->pdev->dev, "device version %d.%02d\n", version, 1593 revision); 1594 if (adapter->gate_control) 1595 dev_info(&adapter->pdev->dev, "gate control detected\n"); 1596 1597 return 0; 1598 1599 register_failed: 1600 tsnep_rxnfc_cleanup(adapter); 1601 rxnfc_init_failed: 1602 tsnep_tc_cleanup(adapter); 1603 tc_init_failed: 1604 tsnep_ptp_cleanup(adapter); 1605 ptp_init_failed: 1606 phy_init_failed: 1607 if (adapter->mdiobus) 1608 mdiobus_unregister(adapter->mdiobus); 1609 mdio_init_failed: 1610 return retval; 1611 } 1612 1613 static int tsnep_remove(struct platform_device *pdev) 1614 { 1615 struct tsnep_adapter *adapter = platform_get_drvdata(pdev); 1616 1617 unregister_netdev(adapter->netdev); 1618 1619 tsnep_rxnfc_cleanup(adapter); 1620 1621 tsnep_tc_cleanup(adapter); 1622 1623 tsnep_ptp_cleanup(adapter); 1624 1625 if (adapter->mdiobus) 1626 mdiobus_unregister(adapter->mdiobus); 1627 1628 tsnep_disable_irq(adapter, ECM_INT_ALL); 1629 1630 return 0; 1631 } 1632 1633 static const struct of_device_id tsnep_of_match[] = { 1634 { .compatible = "engleder,tsnep", }, 1635 { }, 1636 }; 1637 MODULE_DEVICE_TABLE(of, tsnep_of_match); 1638 1639 static struct platform_driver tsnep_driver = { 1640 .driver = { 1641 .name = TSNEP, 1642 .of_match_table = tsnep_of_match, 1643 }, 1644 .probe = tsnep_probe, 1645 .remove = tsnep_remove, 1646 }; 1647 module_platform_driver(tsnep_driver); 1648 1649 MODULE_AUTHOR("Gerhard Engleder <gerhard@engleder-embedded.com>"); 1650 MODULE_DESCRIPTION("TSN endpoint Ethernet MAC driver"); 1651 MODULE_LICENSE("GPL"); 1652