1 /* 2 * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * Driver for the ARC EMAC 10100 (hardware revision 5) 9 * 10 * Contributors: 11 * Amit Bhor 12 * Sameer Dhavale 13 * Vineet Gupta 14 */ 15 16 #include <linux/crc32.h> 17 #include <linux/etherdevice.h> 18 #include <linux/interrupt.h> 19 #include <linux/io.h> 20 #include <linux/module.h> 21 #include <linux/of_address.h> 22 #include <linux/of_irq.h> 23 #include <linux/of_mdio.h> 24 #include <linux/of_net.h> 25 #include <linux/of_platform.h> 26 27 #include "emac.h" 28 29 /** 30 * arc_emac_tx_avail - Return the number of available slots in the tx ring. 31 * @priv: Pointer to ARC EMAC private data structure. 32 * 33 * returns: the number of slots available for transmission in tx the ring. 34 */ 35 static inline int arc_emac_tx_avail(struct arc_emac_priv *priv) 36 { 37 return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM; 38 } 39 40 /** 41 * arc_emac_adjust_link - Adjust the PHY link duplex. 42 * @ndev: Pointer to the net_device structure. 43 * 44 * This function is called to change the duplex setting after auto negotiation 45 * is done by the PHY. 46 */ 47 static void arc_emac_adjust_link(struct net_device *ndev) 48 { 49 struct arc_emac_priv *priv = netdev_priv(ndev); 50 struct phy_device *phy_dev = ndev->phydev; 51 unsigned int reg, state_changed = 0; 52 53 if (priv->link != phy_dev->link) { 54 priv->link = phy_dev->link; 55 state_changed = 1; 56 } 57 58 if (priv->speed != phy_dev->speed) { 59 priv->speed = phy_dev->speed; 60 state_changed = 1; 61 if (priv->set_mac_speed) 62 priv->set_mac_speed(priv, priv->speed); 63 } 64 65 if (priv->duplex != phy_dev->duplex) { 66 reg = arc_reg_get(priv, R_CTRL); 67 68 if (phy_dev->duplex == DUPLEX_FULL) 69 reg |= ENFL_MASK; 70 else 71 reg &= ~ENFL_MASK; 72 73 arc_reg_set(priv, R_CTRL, reg); 74 priv->duplex = phy_dev->duplex; 75 state_changed = 1; 76 } 77 78 if (state_changed) 79 phy_print_status(phy_dev); 80 } 81 82 /** 83 * arc_emac_get_drvinfo - Get EMAC driver information. 84 * @ndev: Pointer to net_device structure. 85 * @info: Pointer to ethtool_drvinfo structure. 86 * 87 * This implements ethtool command for getting the driver information. 88 * Issue "ethtool -i ethX" under linux prompt to execute this function. 89 */ 90 static void arc_emac_get_drvinfo(struct net_device *ndev, 91 struct ethtool_drvinfo *info) 92 { 93 struct arc_emac_priv *priv = netdev_priv(ndev); 94 95 strlcpy(info->driver, priv->drv_name, sizeof(info->driver)); 96 strlcpy(info->version, priv->drv_version, sizeof(info->version)); 97 } 98 99 static const struct ethtool_ops arc_emac_ethtool_ops = { 100 .get_drvinfo = arc_emac_get_drvinfo, 101 .get_link = ethtool_op_get_link, 102 .get_link_ksettings = phy_ethtool_get_link_ksettings, 103 .set_link_ksettings = phy_ethtool_set_link_ksettings, 104 }; 105 106 #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK) 107 108 /** 109 * arc_emac_tx_clean - clears processed by EMAC Tx BDs. 110 * @ndev: Pointer to the network device. 111 */ 112 static void arc_emac_tx_clean(struct net_device *ndev) 113 { 114 struct arc_emac_priv *priv = netdev_priv(ndev); 115 struct net_device_stats *stats = &ndev->stats; 116 unsigned int i; 117 118 for (i = 0; i < TX_BD_NUM; i++) { 119 unsigned int *txbd_dirty = &priv->txbd_dirty; 120 struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty]; 121 struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty]; 122 struct sk_buff *skb = tx_buff->skb; 123 unsigned int info = le32_to_cpu(txbd->info); 124 125 if ((info & FOR_EMAC) || !txbd->data || !skb) 126 break; 127 128 if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) { 129 stats->tx_errors++; 130 stats->tx_dropped++; 131 132 if (info & DEFR) 133 stats->tx_carrier_errors++; 134 135 if (info & LTCL) 136 stats->collisions++; 137 138 if (info & UFLO) 139 stats->tx_fifo_errors++; 140 } else if (likely(info & FIRST_OR_LAST_MASK)) { 141 stats->tx_packets++; 142 stats->tx_bytes += skb->len; 143 } 144 145 dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), 146 dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); 147 148 /* return the sk_buff to system */ 149 dev_kfree_skb_irq(skb); 150 151 txbd->data = 0; 152 txbd->info = 0; 153 tx_buff->skb = NULL; 154 155 *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; 156 } 157 158 /* Ensure that txbd_dirty is visible to tx() before checking 159 * for queue stopped. 160 */ 161 smp_mb(); 162 163 if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv)) 164 netif_wake_queue(ndev); 165 } 166 167 /** 168 * arc_emac_rx - processing of Rx packets. 169 * @ndev: Pointer to the network device. 170 * @budget: How many BDs to process on 1 call. 171 * 172 * returns: Number of processed BDs 173 * 174 * Iterate through Rx BDs and deliver received packages to upper layer. 175 */ 176 static int arc_emac_rx(struct net_device *ndev, int budget) 177 { 178 struct arc_emac_priv *priv = netdev_priv(ndev); 179 unsigned int work_done; 180 181 for (work_done = 0; work_done < budget; work_done++) { 182 unsigned int *last_rx_bd = &priv->last_rx_bd; 183 struct net_device_stats *stats = &ndev->stats; 184 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; 185 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; 186 unsigned int pktlen, info = le32_to_cpu(rxbd->info); 187 struct sk_buff *skb; 188 dma_addr_t addr; 189 190 if (unlikely((info & OWN_MASK) == FOR_EMAC)) 191 break; 192 193 /* Make a note that we saw a packet at this BD. 194 * So next time, driver starts from this + 1 195 */ 196 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; 197 198 if (unlikely((info & FIRST_OR_LAST_MASK) != 199 FIRST_OR_LAST_MASK)) { 200 /* We pre-allocate buffers of MTU size so incoming 201 * packets won't be split/chained. 202 */ 203 if (net_ratelimit()) 204 netdev_err(ndev, "incomplete packet received\n"); 205 206 /* Return ownership to EMAC */ 207 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 208 stats->rx_errors++; 209 stats->rx_length_errors++; 210 continue; 211 } 212 213 pktlen = info & LEN_MASK; 214 stats->rx_packets++; 215 stats->rx_bytes += pktlen; 216 skb = rx_buff->skb; 217 skb_put(skb, pktlen); 218 skb->dev = ndev; 219 skb->protocol = eth_type_trans(skb, ndev); 220 221 dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), 222 dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); 223 224 /* Prepare the BD for next cycle */ 225 rx_buff->skb = netdev_alloc_skb_ip_align(ndev, 226 EMAC_BUFFER_SIZE); 227 if (unlikely(!rx_buff->skb)) { 228 stats->rx_errors++; 229 /* Because receive_skb is below, increment rx_dropped */ 230 stats->rx_dropped++; 231 continue; 232 } 233 234 /* receive_skb only if new skb was allocated to avoid holes */ 235 netif_receive_skb(skb); 236 237 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, 238 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 239 if (dma_mapping_error(&ndev->dev, addr)) { 240 if (net_ratelimit()) 241 netdev_err(ndev, "cannot dma map\n"); 242 dev_kfree_skb(rx_buff->skb); 243 stats->rx_errors++; 244 continue; 245 } 246 dma_unmap_addr_set(rx_buff, addr, addr); 247 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 248 249 rxbd->data = cpu_to_le32(addr); 250 251 /* Make sure pointer to data buffer is set */ 252 wmb(); 253 254 /* Return ownership to EMAC */ 255 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 256 } 257 258 return work_done; 259 } 260 261 /** 262 * arc_emac_poll - NAPI poll handler. 263 * @napi: Pointer to napi_struct structure. 264 * @budget: How many BDs to process on 1 call. 265 * 266 * returns: Number of processed BDs 267 */ 268 static int arc_emac_poll(struct napi_struct *napi, int budget) 269 { 270 struct net_device *ndev = napi->dev; 271 struct arc_emac_priv *priv = netdev_priv(ndev); 272 unsigned int work_done; 273 274 arc_emac_tx_clean(ndev); 275 276 work_done = arc_emac_rx(ndev, budget); 277 if (work_done < budget) { 278 napi_complete(napi); 279 arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); 280 } 281 282 return work_done; 283 } 284 285 /** 286 * arc_emac_intr - Global interrupt handler for EMAC. 287 * @irq: irq number. 288 * @dev_instance: device instance. 289 * 290 * returns: IRQ_HANDLED for all cases. 291 * 292 * ARC EMAC has only 1 interrupt line, and depending on bits raised in 293 * STATUS register we may tell what is a reason for interrupt to fire. 294 */ 295 static irqreturn_t arc_emac_intr(int irq, void *dev_instance) 296 { 297 struct net_device *ndev = dev_instance; 298 struct arc_emac_priv *priv = netdev_priv(ndev); 299 struct net_device_stats *stats = &ndev->stats; 300 unsigned int status; 301 302 status = arc_reg_get(priv, R_STATUS); 303 status &= ~MDIO_MASK; 304 305 /* Reset all flags except "MDIO complete" */ 306 arc_reg_set(priv, R_STATUS, status); 307 308 if (status & (RXINT_MASK | TXINT_MASK)) { 309 if (likely(napi_schedule_prep(&priv->napi))) { 310 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); 311 __napi_schedule(&priv->napi); 312 } 313 } 314 315 if (status & ERR_MASK) { 316 /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding 317 * 8-bit error counter overrun. 318 */ 319 320 if (status & MSER_MASK) { 321 stats->rx_missed_errors += 0x100; 322 stats->rx_errors += 0x100; 323 } 324 325 if (status & RXCR_MASK) { 326 stats->rx_crc_errors += 0x100; 327 stats->rx_errors += 0x100; 328 } 329 330 if (status & RXFR_MASK) { 331 stats->rx_frame_errors += 0x100; 332 stats->rx_errors += 0x100; 333 } 334 335 if (status & RXFL_MASK) { 336 stats->rx_over_errors += 0x100; 337 stats->rx_errors += 0x100; 338 } 339 } 340 341 return IRQ_HANDLED; 342 } 343 344 #ifdef CONFIG_NET_POLL_CONTROLLER 345 static void arc_emac_poll_controller(struct net_device *dev) 346 { 347 disable_irq(dev->irq); 348 arc_emac_intr(dev->irq, dev); 349 enable_irq(dev->irq); 350 } 351 #endif 352 353 /** 354 * arc_emac_open - Open the network device. 355 * @ndev: Pointer to the network device. 356 * 357 * returns: 0, on success or non-zero error value on failure. 358 * 359 * This function sets the MAC address, requests and enables an IRQ 360 * for the EMAC device and starts the Tx queue. 361 * It also connects to the phy device. 362 */ 363 static int arc_emac_open(struct net_device *ndev) 364 { 365 struct arc_emac_priv *priv = netdev_priv(ndev); 366 struct phy_device *phy_dev = ndev->phydev; 367 int i; 368 369 phy_dev->autoneg = AUTONEG_ENABLE; 370 phy_dev->speed = 0; 371 phy_dev->duplex = 0; 372 phy_dev->advertising &= phy_dev->supported; 373 374 priv->last_rx_bd = 0; 375 376 /* Allocate and set buffers for Rx BD's */ 377 for (i = 0; i < RX_BD_NUM; i++) { 378 dma_addr_t addr; 379 unsigned int *last_rx_bd = &priv->last_rx_bd; 380 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; 381 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; 382 383 rx_buff->skb = netdev_alloc_skb_ip_align(ndev, 384 EMAC_BUFFER_SIZE); 385 if (unlikely(!rx_buff->skb)) 386 return -ENOMEM; 387 388 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, 389 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 390 if (dma_mapping_error(&ndev->dev, addr)) { 391 netdev_err(ndev, "cannot dma map\n"); 392 dev_kfree_skb(rx_buff->skb); 393 return -ENOMEM; 394 } 395 dma_unmap_addr_set(rx_buff, addr, addr); 396 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 397 398 rxbd->data = cpu_to_le32(addr); 399 400 /* Make sure pointer to data buffer is set */ 401 wmb(); 402 403 /* Return ownership to EMAC */ 404 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 405 406 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; 407 } 408 409 priv->txbd_curr = 0; 410 priv->txbd_dirty = 0; 411 412 /* Clean Tx BD's */ 413 memset(priv->txbd, 0, TX_RING_SZ); 414 415 /* Initialize logical address filter */ 416 arc_reg_set(priv, R_LAFL, 0); 417 arc_reg_set(priv, R_LAFH, 0); 418 419 /* Set BD ring pointers for device side */ 420 arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma); 421 arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma); 422 423 /* Enable interrupts */ 424 arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); 425 426 /* Set CONTROL */ 427 arc_reg_set(priv, R_CTRL, 428 (RX_BD_NUM << 24) | /* RX BD table length */ 429 (TX_BD_NUM << 16) | /* TX BD table length */ 430 TXRN_MASK | RXRN_MASK); 431 432 napi_enable(&priv->napi); 433 434 /* Enable EMAC */ 435 arc_reg_or(priv, R_CTRL, EN_MASK); 436 437 phy_start_aneg(ndev->phydev); 438 439 netif_start_queue(ndev); 440 441 return 0; 442 } 443 444 /** 445 * arc_emac_set_rx_mode - Change the receive filtering mode. 446 * @ndev: Pointer to the network device. 447 * 448 * This function enables/disables promiscuous or all-multicast mode 449 * and updates the multicast filtering list of the network device. 450 */ 451 static void arc_emac_set_rx_mode(struct net_device *ndev) 452 { 453 struct arc_emac_priv *priv = netdev_priv(ndev); 454 455 if (ndev->flags & IFF_PROMISC) { 456 arc_reg_or(priv, R_CTRL, PROM_MASK); 457 } else { 458 arc_reg_clr(priv, R_CTRL, PROM_MASK); 459 460 if (ndev->flags & IFF_ALLMULTI) { 461 arc_reg_set(priv, R_LAFL, ~0); 462 arc_reg_set(priv, R_LAFH, ~0); 463 } else { 464 struct netdev_hw_addr *ha; 465 unsigned int filter[2] = { 0, 0 }; 466 int bit; 467 468 netdev_for_each_mc_addr(ha, ndev) { 469 bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26; 470 filter[bit >> 5] |= 1 << (bit & 31); 471 } 472 473 arc_reg_set(priv, R_LAFL, filter[0]); 474 arc_reg_set(priv, R_LAFH, filter[1]); 475 } 476 } 477 } 478 479 /** 480 * arc_free_tx_queue - free skb from tx queue 481 * @ndev: Pointer to the network device. 482 * 483 * This function must be called while EMAC disable 484 */ 485 static void arc_free_tx_queue(struct net_device *ndev) 486 { 487 struct arc_emac_priv *priv = netdev_priv(ndev); 488 unsigned int i; 489 490 for (i = 0; i < TX_BD_NUM; i++) { 491 struct arc_emac_bd *txbd = &priv->txbd[i]; 492 struct buffer_state *tx_buff = &priv->tx_buff[i]; 493 494 if (tx_buff->skb) { 495 dma_unmap_single(&ndev->dev, 496 dma_unmap_addr(tx_buff, addr), 497 dma_unmap_len(tx_buff, len), 498 DMA_TO_DEVICE); 499 500 /* return the sk_buff to system */ 501 dev_kfree_skb_irq(tx_buff->skb); 502 } 503 504 txbd->info = 0; 505 txbd->data = 0; 506 tx_buff->skb = NULL; 507 } 508 } 509 510 /** 511 * arc_free_rx_queue - free skb from rx queue 512 * @ndev: Pointer to the network device. 513 * 514 * This function must be called while EMAC disable 515 */ 516 static void arc_free_rx_queue(struct net_device *ndev) 517 { 518 struct arc_emac_priv *priv = netdev_priv(ndev); 519 unsigned int i; 520 521 for (i = 0; i < RX_BD_NUM; i++) { 522 struct arc_emac_bd *rxbd = &priv->rxbd[i]; 523 struct buffer_state *rx_buff = &priv->rx_buff[i]; 524 525 if (rx_buff->skb) { 526 dma_unmap_single(&ndev->dev, 527 dma_unmap_addr(rx_buff, addr), 528 dma_unmap_len(rx_buff, len), 529 DMA_FROM_DEVICE); 530 531 /* return the sk_buff to system */ 532 dev_kfree_skb_irq(rx_buff->skb); 533 } 534 535 rxbd->info = 0; 536 rxbd->data = 0; 537 rx_buff->skb = NULL; 538 } 539 } 540 541 /** 542 * arc_emac_stop - Close the network device. 543 * @ndev: Pointer to the network device. 544 * 545 * This function stops the Tx queue, disables interrupts and frees the IRQ for 546 * the EMAC device. 547 * It also disconnects the PHY device associated with the EMAC device. 548 */ 549 static int arc_emac_stop(struct net_device *ndev) 550 { 551 struct arc_emac_priv *priv = netdev_priv(ndev); 552 553 napi_disable(&priv->napi); 554 netif_stop_queue(ndev); 555 556 /* Disable interrupts */ 557 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); 558 559 /* Disable EMAC */ 560 arc_reg_clr(priv, R_CTRL, EN_MASK); 561 562 /* Return the sk_buff to system */ 563 arc_free_tx_queue(ndev); 564 arc_free_rx_queue(ndev); 565 566 return 0; 567 } 568 569 /** 570 * arc_emac_stats - Get system network statistics. 571 * @ndev: Pointer to net_device structure. 572 * 573 * Returns the address of the device statistics structure. 574 * Statistics are updated in interrupt handler. 575 */ 576 static struct net_device_stats *arc_emac_stats(struct net_device *ndev) 577 { 578 struct arc_emac_priv *priv = netdev_priv(ndev); 579 struct net_device_stats *stats = &ndev->stats; 580 unsigned long miss, rxerr; 581 u8 rxcrc, rxfram, rxoflow; 582 583 rxerr = arc_reg_get(priv, R_RXERR); 584 miss = arc_reg_get(priv, R_MISS); 585 586 rxcrc = rxerr; 587 rxfram = rxerr >> 8; 588 rxoflow = rxerr >> 16; 589 590 stats->rx_errors += miss; 591 stats->rx_errors += rxcrc + rxfram + rxoflow; 592 593 stats->rx_over_errors += rxoflow; 594 stats->rx_frame_errors += rxfram; 595 stats->rx_crc_errors += rxcrc; 596 stats->rx_missed_errors += miss; 597 598 return stats; 599 } 600 601 /** 602 * arc_emac_tx - Starts the data transmission. 603 * @skb: sk_buff pointer that contains data to be Transmitted. 604 * @ndev: Pointer to net_device structure. 605 * 606 * returns: NETDEV_TX_OK, on success 607 * NETDEV_TX_BUSY, if any of the descriptors are not free. 608 * 609 * This function is invoked from upper layers to initiate transmission. 610 */ 611 static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) 612 { 613 struct arc_emac_priv *priv = netdev_priv(ndev); 614 unsigned int len, *txbd_curr = &priv->txbd_curr; 615 struct net_device_stats *stats = &ndev->stats; 616 __le32 *info = &priv->txbd[*txbd_curr].info; 617 dma_addr_t addr; 618 619 if (skb_padto(skb, ETH_ZLEN)) 620 return NETDEV_TX_OK; 621 622 len = max_t(unsigned int, ETH_ZLEN, skb->len); 623 624 if (unlikely(!arc_emac_tx_avail(priv))) { 625 netif_stop_queue(ndev); 626 netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n"); 627 return NETDEV_TX_BUSY; 628 } 629 630 addr = dma_map_single(&ndev->dev, (void *)skb->data, len, 631 DMA_TO_DEVICE); 632 633 if (unlikely(dma_mapping_error(&ndev->dev, addr))) { 634 stats->tx_dropped++; 635 stats->tx_errors++; 636 dev_kfree_skb(skb); 637 return NETDEV_TX_OK; 638 } 639 dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); 640 dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); 641 642 priv->txbd[*txbd_curr].data = cpu_to_le32(addr); 643 644 /* Make sure pointer to data buffer is set */ 645 wmb(); 646 647 skb_tx_timestamp(skb); 648 649 *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); 650 651 /* Make sure info word is set */ 652 wmb(); 653 654 priv->tx_buff[*txbd_curr].skb = skb; 655 656 /* Increment index to point to the next BD */ 657 *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; 658 659 /* Ensure that tx_clean() sees the new txbd_curr before 660 * checking the queue status. This prevents an unneeded wake 661 * of the queue in tx_clean(). 662 */ 663 smp_mb(); 664 665 if (!arc_emac_tx_avail(priv)) { 666 netif_stop_queue(ndev); 667 /* Refresh tx_dirty */ 668 smp_mb(); 669 if (arc_emac_tx_avail(priv)) 670 netif_start_queue(ndev); 671 } 672 673 arc_reg_set(priv, R_STATUS, TXPL_MASK); 674 675 return NETDEV_TX_OK; 676 } 677 678 static void arc_emac_set_address_internal(struct net_device *ndev) 679 { 680 struct arc_emac_priv *priv = netdev_priv(ndev); 681 unsigned int addr_low, addr_hi; 682 683 addr_low = le32_to_cpu(*(__le32 *)&ndev->dev_addr[0]); 684 addr_hi = le16_to_cpu(*(__le16 *)&ndev->dev_addr[4]); 685 686 arc_reg_set(priv, R_ADDRL, addr_low); 687 arc_reg_set(priv, R_ADDRH, addr_hi); 688 } 689 690 /** 691 * arc_emac_set_address - Set the MAC address for this device. 692 * @ndev: Pointer to net_device structure. 693 * @p: 6 byte Address to be written as MAC address. 694 * 695 * This function copies the HW address from the sockaddr structure to the 696 * net_device structure and updates the address in HW. 697 * 698 * returns: -EBUSY if the net device is busy or 0 if the address is set 699 * successfully. 700 */ 701 static int arc_emac_set_address(struct net_device *ndev, void *p) 702 { 703 struct sockaddr *addr = p; 704 705 if (netif_running(ndev)) 706 return -EBUSY; 707 708 if (!is_valid_ether_addr(addr->sa_data)) 709 return -EADDRNOTAVAIL; 710 711 memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); 712 713 arc_emac_set_address_internal(ndev); 714 715 return 0; 716 } 717 718 static const struct net_device_ops arc_emac_netdev_ops = { 719 .ndo_open = arc_emac_open, 720 .ndo_stop = arc_emac_stop, 721 .ndo_start_xmit = arc_emac_tx, 722 .ndo_set_mac_address = arc_emac_set_address, 723 .ndo_get_stats = arc_emac_stats, 724 .ndo_set_rx_mode = arc_emac_set_rx_mode, 725 #ifdef CONFIG_NET_POLL_CONTROLLER 726 .ndo_poll_controller = arc_emac_poll_controller, 727 #endif 728 }; 729 730 int arc_emac_probe(struct net_device *ndev, int interface) 731 { 732 struct device *dev = ndev->dev.parent; 733 struct resource res_regs; 734 struct device_node *phy_node; 735 struct phy_device *phydev = NULL; 736 struct arc_emac_priv *priv; 737 const char *mac_addr; 738 unsigned int id, clock_frequency, irq; 739 int err; 740 741 /* Get PHY from device tree */ 742 phy_node = of_parse_phandle(dev->of_node, "phy", 0); 743 if (!phy_node) { 744 dev_err(dev, "failed to retrieve phy description from device tree\n"); 745 return -ENODEV; 746 } 747 748 /* Get EMAC registers base address from device tree */ 749 err = of_address_to_resource(dev->of_node, 0, &res_regs); 750 if (err) { 751 dev_err(dev, "failed to retrieve registers base from device tree\n"); 752 err = -ENODEV; 753 goto out_put_node; 754 } 755 756 /* Get IRQ from device tree */ 757 irq = irq_of_parse_and_map(dev->of_node, 0); 758 if (!irq) { 759 dev_err(dev, "failed to retrieve <irq> value from device tree\n"); 760 err = -ENODEV; 761 goto out_put_node; 762 } 763 764 ndev->netdev_ops = &arc_emac_netdev_ops; 765 ndev->ethtool_ops = &arc_emac_ethtool_ops; 766 ndev->watchdog_timeo = TX_TIMEOUT; 767 /* FIXME :: no multicast support yet */ 768 ndev->flags &= ~IFF_MULTICAST; 769 770 priv = netdev_priv(ndev); 771 priv->dev = dev; 772 773 priv->regs = devm_ioremap_resource(dev, &res_regs); 774 if (IS_ERR(priv->regs)) { 775 err = PTR_ERR(priv->regs); 776 goto out_put_node; 777 } 778 779 dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs); 780 781 if (priv->clk) { 782 err = clk_prepare_enable(priv->clk); 783 if (err) { 784 dev_err(dev, "failed to enable clock\n"); 785 goto out_put_node; 786 } 787 788 clock_frequency = clk_get_rate(priv->clk); 789 } else { 790 /* Get CPU clock frequency from device tree */ 791 if (of_property_read_u32(dev->of_node, "clock-frequency", 792 &clock_frequency)) { 793 dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n"); 794 err = -EINVAL; 795 goto out_put_node; 796 } 797 } 798 799 id = arc_reg_get(priv, R_ID); 800 801 /* Check for EMAC revision 5 or 7, magic number */ 802 if (!(id == 0x0005fd02 || id == 0x0007fd02)) { 803 dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id); 804 err = -ENODEV; 805 goto out_clken; 806 } 807 dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id); 808 809 /* Set poll rate so that it polls every 1 ms */ 810 arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); 811 812 ndev->irq = irq; 813 dev_info(dev, "IRQ is %d\n", ndev->irq); 814 815 /* Register interrupt handler for device */ 816 err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0, 817 ndev->name, ndev); 818 if (err) { 819 dev_err(dev, "could not allocate IRQ\n"); 820 goto out_clken; 821 } 822 823 /* Get MAC address from device tree */ 824 mac_addr = of_get_mac_address(dev->of_node); 825 826 if (mac_addr) 827 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); 828 else 829 eth_hw_addr_random(ndev); 830 831 arc_emac_set_address_internal(ndev); 832 dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); 833 834 /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ 835 priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ, 836 &priv->rxbd_dma, GFP_KERNEL); 837 838 if (!priv->rxbd) { 839 dev_err(dev, "failed to allocate data buffers\n"); 840 err = -ENOMEM; 841 goto out_clken; 842 } 843 844 priv->txbd = priv->rxbd + RX_BD_NUM; 845 846 priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; 847 dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", 848 (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); 849 850 err = arc_mdio_probe(priv); 851 if (err) { 852 dev_err(dev, "failed to probe MII bus\n"); 853 goto out_clken; 854 } 855 856 phydev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, 857 interface); 858 if (!phydev) { 859 dev_err(dev, "of_phy_connect() failed\n"); 860 err = -ENODEV; 861 goto out_mdio; 862 } 863 864 dev_info(dev, "connected to %s phy with id 0x%x\n", 865 phydev->drv->name, phydev->phy_id); 866 867 netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); 868 869 err = register_netdev(ndev); 870 if (err) { 871 dev_err(dev, "failed to register network device\n"); 872 goto out_netif_api; 873 } 874 875 of_node_put(phy_node); 876 return 0; 877 878 out_netif_api: 879 netif_napi_del(&priv->napi); 880 phy_disconnect(phydev); 881 out_mdio: 882 arc_mdio_remove(priv); 883 out_clken: 884 if (priv->clk) 885 clk_disable_unprepare(priv->clk); 886 out_put_node: 887 of_node_put(phy_node); 888 889 return err; 890 } 891 EXPORT_SYMBOL_GPL(arc_emac_probe); 892 893 int arc_emac_remove(struct net_device *ndev) 894 { 895 struct arc_emac_priv *priv = netdev_priv(ndev); 896 897 phy_disconnect(ndev->phydev); 898 arc_mdio_remove(priv); 899 unregister_netdev(ndev); 900 netif_napi_del(&priv->napi); 901 902 if (!IS_ERR(priv->clk)) 903 clk_disable_unprepare(priv->clk); 904 905 return 0; 906 } 907 EXPORT_SYMBOL_GPL(arc_emac_remove); 908 909 MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); 910 MODULE_DESCRIPTION("ARC EMAC driver"); 911 MODULE_LICENSE("GPL"); 912