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/etherdevice.h> 17 #include <linux/interrupt.h> 18 #include <linux/io.h> 19 #include <linux/module.h> 20 #include <linux/of_address.h> 21 #include <linux/of_irq.h> 22 #include <linux/of_mdio.h> 23 #include <linux/of_net.h> 24 #include <linux/of_platform.h> 25 26 #include "emac.h" 27 28 #define DRV_NAME "arc_emac" 29 #define DRV_VERSION "1.0" 30 31 /** 32 * arc_emac_adjust_link - Adjust the PHY link duplex. 33 * @ndev: Pointer to the net_device structure. 34 * 35 * This function is called to change the duplex setting after auto negotiation 36 * is done by the PHY. 37 */ 38 static void arc_emac_adjust_link(struct net_device *ndev) 39 { 40 struct arc_emac_priv *priv = netdev_priv(ndev); 41 struct phy_device *phy_dev = priv->phy_dev; 42 unsigned int reg, state_changed = 0; 43 44 if (priv->link != phy_dev->link) { 45 priv->link = phy_dev->link; 46 state_changed = 1; 47 } 48 49 if (priv->speed != phy_dev->speed) { 50 priv->speed = phy_dev->speed; 51 state_changed = 1; 52 } 53 54 if (priv->duplex != phy_dev->duplex) { 55 reg = arc_reg_get(priv, R_CTRL); 56 57 if (DUPLEX_FULL == phy_dev->duplex) 58 reg |= ENFL_MASK; 59 else 60 reg &= ~ENFL_MASK; 61 62 arc_reg_set(priv, R_CTRL, reg); 63 priv->duplex = phy_dev->duplex; 64 state_changed = 1; 65 } 66 67 if (state_changed) 68 phy_print_status(phy_dev); 69 } 70 71 /** 72 * arc_emac_get_settings - Get PHY settings. 73 * @ndev: Pointer to net_device structure. 74 * @cmd: Pointer to ethtool_cmd structure. 75 * 76 * This implements ethtool command for getting PHY settings. If PHY could 77 * not be found, the function returns -ENODEV. This function calls the 78 * relevant PHY ethtool API to get the PHY settings. 79 * Issue "ethtool ethX" under linux prompt to execute this function. 80 */ 81 static int arc_emac_get_settings(struct net_device *ndev, 82 struct ethtool_cmd *cmd) 83 { 84 struct arc_emac_priv *priv = netdev_priv(ndev); 85 86 return phy_ethtool_gset(priv->phy_dev, cmd); 87 } 88 89 /** 90 * arc_emac_set_settings - Set PHY settings as passed in the argument. 91 * @ndev: Pointer to net_device structure. 92 * @cmd: Pointer to ethtool_cmd structure. 93 * 94 * This implements ethtool command for setting various PHY settings. If PHY 95 * could not be found, the function returns -ENODEV. This function calls the 96 * relevant PHY ethtool API to set the PHY. 97 * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this 98 * function. 99 */ 100 static int arc_emac_set_settings(struct net_device *ndev, 101 struct ethtool_cmd *cmd) 102 { 103 struct arc_emac_priv *priv = netdev_priv(ndev); 104 105 if (!capable(CAP_NET_ADMIN)) 106 return -EPERM; 107 108 return phy_ethtool_sset(priv->phy_dev, cmd); 109 } 110 111 /** 112 * arc_emac_get_drvinfo - Get EMAC driver information. 113 * @ndev: Pointer to net_device structure. 114 * @info: Pointer to ethtool_drvinfo structure. 115 * 116 * This implements ethtool command for getting the driver information. 117 * Issue "ethtool -i ethX" under linux prompt to execute this function. 118 */ 119 static void arc_emac_get_drvinfo(struct net_device *ndev, 120 struct ethtool_drvinfo *info) 121 { 122 strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); 123 strlcpy(info->version, DRV_VERSION, sizeof(info->version)); 124 } 125 126 static const struct ethtool_ops arc_emac_ethtool_ops = { 127 .get_settings = arc_emac_get_settings, 128 .set_settings = arc_emac_set_settings, 129 .get_drvinfo = arc_emac_get_drvinfo, 130 .get_link = ethtool_op_get_link, 131 }; 132 133 #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK) 134 135 /** 136 * arc_emac_tx_clean - clears processed by EMAC Tx BDs. 137 * @ndev: Pointer to the network device. 138 */ 139 static void arc_emac_tx_clean(struct net_device *ndev) 140 { 141 struct arc_emac_priv *priv = netdev_priv(ndev); 142 struct net_device_stats *stats = &priv->stats; 143 unsigned int i; 144 145 for (i = 0; i < TX_BD_NUM; i++) { 146 unsigned int *txbd_dirty = &priv->txbd_dirty; 147 struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty]; 148 struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty]; 149 struct sk_buff *skb = tx_buff->skb; 150 unsigned int info = le32_to_cpu(txbd->info); 151 152 if ((info & FOR_EMAC) || !txbd->data) 153 break; 154 155 if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) { 156 stats->tx_errors++; 157 stats->tx_dropped++; 158 159 if (info & DEFR) 160 stats->tx_carrier_errors++; 161 162 if (info & LTCL) 163 stats->collisions++; 164 165 if (info & UFLO) 166 stats->tx_fifo_errors++; 167 } else if (likely(info & FIRST_OR_LAST_MASK)) { 168 stats->tx_packets++; 169 stats->tx_bytes += skb->len; 170 } 171 172 dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), 173 dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); 174 175 /* return the sk_buff to system */ 176 dev_kfree_skb_irq(skb); 177 178 txbd->data = 0; 179 txbd->info = 0; 180 181 *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; 182 183 if (netif_queue_stopped(ndev)) 184 netif_wake_queue(ndev); 185 } 186 } 187 188 /** 189 * arc_emac_rx - processing of Rx packets. 190 * @ndev: Pointer to the network device. 191 * @budget: How many BDs to process on 1 call. 192 * 193 * returns: Number of processed BDs 194 * 195 * Iterate through Rx BDs and deliver received packages to upper layer. 196 */ 197 static int arc_emac_rx(struct net_device *ndev, int budget) 198 { 199 struct arc_emac_priv *priv = netdev_priv(ndev); 200 unsigned int work_done; 201 202 for (work_done = 0; work_done < budget; work_done++) { 203 unsigned int *last_rx_bd = &priv->last_rx_bd; 204 struct net_device_stats *stats = &priv->stats; 205 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; 206 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; 207 unsigned int pktlen, info = le32_to_cpu(rxbd->info); 208 struct sk_buff *skb; 209 dma_addr_t addr; 210 211 if (unlikely((info & OWN_MASK) == FOR_EMAC)) 212 break; 213 214 /* Make a note that we saw a packet at this BD. 215 * So next time, driver starts from this + 1 216 */ 217 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; 218 219 if (unlikely((info & FIRST_OR_LAST_MASK) != 220 FIRST_OR_LAST_MASK)) { 221 /* We pre-allocate buffers of MTU size so incoming 222 * packets won't be split/chained. 223 */ 224 if (net_ratelimit()) 225 netdev_err(ndev, "incomplete packet received\n"); 226 227 /* Return ownership to EMAC */ 228 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 229 stats->rx_errors++; 230 stats->rx_length_errors++; 231 continue; 232 } 233 234 pktlen = info & LEN_MASK; 235 stats->rx_packets++; 236 stats->rx_bytes += pktlen; 237 skb = rx_buff->skb; 238 skb_put(skb, pktlen); 239 skb->dev = ndev; 240 skb->protocol = eth_type_trans(skb, ndev); 241 242 dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), 243 dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); 244 245 /* Prepare the BD for next cycle */ 246 rx_buff->skb = netdev_alloc_skb_ip_align(ndev, 247 EMAC_BUFFER_SIZE); 248 if (unlikely(!rx_buff->skb)) { 249 stats->rx_errors++; 250 /* Because receive_skb is below, increment rx_dropped */ 251 stats->rx_dropped++; 252 continue; 253 } 254 255 /* receive_skb only if new skb was allocated to avoid holes */ 256 netif_receive_skb(skb); 257 258 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, 259 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 260 if (dma_mapping_error(&ndev->dev, addr)) { 261 if (net_ratelimit()) 262 netdev_err(ndev, "cannot dma map\n"); 263 dev_kfree_skb(rx_buff->skb); 264 stats->rx_errors++; 265 continue; 266 } 267 dma_unmap_addr_set(rx_buff, addr, addr); 268 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 269 270 rxbd->data = cpu_to_le32(addr); 271 272 /* Make sure pointer to data buffer is set */ 273 wmb(); 274 275 /* Return ownership to EMAC */ 276 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 277 } 278 279 return work_done; 280 } 281 282 /** 283 * arc_emac_poll - NAPI poll handler. 284 * @napi: Pointer to napi_struct structure. 285 * @budget: How many BDs to process on 1 call. 286 * 287 * returns: Number of processed BDs 288 */ 289 static int arc_emac_poll(struct napi_struct *napi, int budget) 290 { 291 struct net_device *ndev = napi->dev; 292 struct arc_emac_priv *priv = netdev_priv(ndev); 293 unsigned int work_done; 294 295 arc_emac_tx_clean(ndev); 296 297 work_done = arc_emac_rx(ndev, budget); 298 if (work_done < budget) { 299 napi_complete(napi); 300 arc_reg_or(priv, R_ENABLE, RXINT_MASK); 301 } 302 303 return work_done; 304 } 305 306 /** 307 * arc_emac_intr - Global interrupt handler for EMAC. 308 * @irq: irq number. 309 * @dev_instance: device instance. 310 * 311 * returns: IRQ_HANDLED for all cases. 312 * 313 * ARC EMAC has only 1 interrupt line, and depending on bits raised in 314 * STATUS register we may tell what is a reason for interrupt to fire. 315 */ 316 static irqreturn_t arc_emac_intr(int irq, void *dev_instance) 317 { 318 struct net_device *ndev = dev_instance; 319 struct arc_emac_priv *priv = netdev_priv(ndev); 320 struct net_device_stats *stats = &priv->stats; 321 unsigned int status; 322 323 status = arc_reg_get(priv, R_STATUS); 324 status &= ~MDIO_MASK; 325 326 /* Reset all flags except "MDIO complete" */ 327 arc_reg_set(priv, R_STATUS, status); 328 329 if (status & RXINT_MASK) { 330 if (likely(napi_schedule_prep(&priv->napi))) { 331 arc_reg_clr(priv, R_ENABLE, RXINT_MASK); 332 __napi_schedule(&priv->napi); 333 } 334 } 335 336 if (status & ERR_MASK) { 337 /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding 338 * 8-bit error counter overrun. 339 */ 340 341 if (status & MSER_MASK) { 342 stats->rx_missed_errors += 0x100; 343 stats->rx_errors += 0x100; 344 } 345 346 if (status & RXCR_MASK) { 347 stats->rx_crc_errors += 0x100; 348 stats->rx_errors += 0x100; 349 } 350 351 if (status & RXFR_MASK) { 352 stats->rx_frame_errors += 0x100; 353 stats->rx_errors += 0x100; 354 } 355 356 if (status & RXFL_MASK) { 357 stats->rx_over_errors += 0x100; 358 stats->rx_errors += 0x100; 359 } 360 } 361 362 return IRQ_HANDLED; 363 } 364 365 /** 366 * arc_emac_open - Open the network device. 367 * @ndev: Pointer to the network device. 368 * 369 * returns: 0, on success or non-zero error value on failure. 370 * 371 * This function sets the MAC address, requests and enables an IRQ 372 * for the EMAC device and starts the Tx queue. 373 * It also connects to the phy device. 374 */ 375 static int arc_emac_open(struct net_device *ndev) 376 { 377 struct arc_emac_priv *priv = netdev_priv(ndev); 378 struct phy_device *phy_dev = priv->phy_dev; 379 int i; 380 381 phy_dev->autoneg = AUTONEG_ENABLE; 382 phy_dev->speed = 0; 383 phy_dev->duplex = 0; 384 phy_dev->advertising &= phy_dev->supported; 385 386 priv->last_rx_bd = 0; 387 388 /* Allocate and set buffers for Rx BD's */ 389 for (i = 0; i < RX_BD_NUM; i++) { 390 dma_addr_t addr; 391 unsigned int *last_rx_bd = &priv->last_rx_bd; 392 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; 393 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; 394 395 rx_buff->skb = netdev_alloc_skb_ip_align(ndev, 396 EMAC_BUFFER_SIZE); 397 if (unlikely(!rx_buff->skb)) 398 return -ENOMEM; 399 400 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, 401 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 402 if (dma_mapping_error(&ndev->dev, addr)) { 403 netdev_err(ndev, "cannot dma map\n"); 404 dev_kfree_skb(rx_buff->skb); 405 return -ENOMEM; 406 } 407 dma_unmap_addr_set(rx_buff, addr, addr); 408 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 409 410 rxbd->data = cpu_to_le32(addr); 411 412 /* Make sure pointer to data buffer is set */ 413 wmb(); 414 415 /* Return ownership to EMAC */ 416 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 417 418 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; 419 } 420 421 /* Clean Tx BD's */ 422 memset(priv->txbd, 0, TX_RING_SZ); 423 424 /* Initialize logical address filter */ 425 arc_reg_set(priv, R_LAFL, 0); 426 arc_reg_set(priv, R_LAFH, 0); 427 428 /* Set BD ring pointers for device side */ 429 arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma); 430 arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma); 431 432 /* Enable interrupts */ 433 arc_reg_set(priv, R_ENABLE, RXINT_MASK | ERR_MASK); 434 435 /* Set CONTROL */ 436 arc_reg_set(priv, R_CTRL, 437 (RX_BD_NUM << 24) | /* RX BD table length */ 438 (TX_BD_NUM << 16) | /* TX BD table length */ 439 TXRN_MASK | RXRN_MASK); 440 441 napi_enable(&priv->napi); 442 443 /* Enable EMAC */ 444 arc_reg_or(priv, R_CTRL, EN_MASK); 445 446 phy_start_aneg(priv->phy_dev); 447 448 netif_start_queue(ndev); 449 450 return 0; 451 } 452 453 /** 454 * arc_emac_stop - Close the network device. 455 * @ndev: Pointer to the network device. 456 * 457 * This function stops the Tx queue, disables interrupts and frees the IRQ for 458 * the EMAC device. 459 * It also disconnects the PHY device associated with the EMAC device. 460 */ 461 static int arc_emac_stop(struct net_device *ndev) 462 { 463 struct arc_emac_priv *priv = netdev_priv(ndev); 464 465 napi_disable(&priv->napi); 466 netif_stop_queue(ndev); 467 468 /* Disable interrupts */ 469 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | ERR_MASK); 470 471 /* Disable EMAC */ 472 arc_reg_clr(priv, R_CTRL, EN_MASK); 473 474 return 0; 475 } 476 477 /** 478 * arc_emac_stats - Get system network statistics. 479 * @ndev: Pointer to net_device structure. 480 * 481 * Returns the address of the device statistics structure. 482 * Statistics are updated in interrupt handler. 483 */ 484 static struct net_device_stats *arc_emac_stats(struct net_device *ndev) 485 { 486 struct arc_emac_priv *priv = netdev_priv(ndev); 487 struct net_device_stats *stats = &priv->stats; 488 unsigned long miss, rxerr; 489 u8 rxcrc, rxfram, rxoflow; 490 491 rxerr = arc_reg_get(priv, R_RXERR); 492 miss = arc_reg_get(priv, R_MISS); 493 494 rxcrc = rxerr; 495 rxfram = rxerr >> 8; 496 rxoflow = rxerr >> 16; 497 498 stats->rx_errors += miss; 499 stats->rx_errors += rxcrc + rxfram + rxoflow; 500 501 stats->rx_over_errors += rxoflow; 502 stats->rx_frame_errors += rxfram; 503 stats->rx_crc_errors += rxcrc; 504 stats->rx_missed_errors += miss; 505 506 return stats; 507 } 508 509 /** 510 * arc_emac_tx - Starts the data transmission. 511 * @skb: sk_buff pointer that contains data to be Transmitted. 512 * @ndev: Pointer to net_device structure. 513 * 514 * returns: NETDEV_TX_OK, on success 515 * NETDEV_TX_BUSY, if any of the descriptors are not free. 516 * 517 * This function is invoked from upper layers to initiate transmission. 518 */ 519 static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) 520 { 521 struct arc_emac_priv *priv = netdev_priv(ndev); 522 unsigned int len, *txbd_curr = &priv->txbd_curr; 523 struct net_device_stats *stats = &priv->stats; 524 __le32 *info = &priv->txbd[*txbd_curr].info; 525 dma_addr_t addr; 526 527 if (skb_padto(skb, ETH_ZLEN)) 528 return NETDEV_TX_OK; 529 530 len = max_t(unsigned int, ETH_ZLEN, skb->len); 531 532 /* EMAC still holds this buffer in its possession. 533 * CPU must not modify this buffer descriptor 534 */ 535 if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) { 536 netif_stop_queue(ndev); 537 return NETDEV_TX_BUSY; 538 } 539 540 addr = dma_map_single(&ndev->dev, (void *)skb->data, len, 541 DMA_TO_DEVICE); 542 543 if (unlikely(dma_mapping_error(&ndev->dev, addr))) { 544 stats->tx_dropped++; 545 stats->tx_errors++; 546 dev_kfree_skb(skb); 547 return NETDEV_TX_OK; 548 } 549 dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); 550 dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); 551 552 priv->tx_buff[*txbd_curr].skb = skb; 553 priv->txbd[*txbd_curr].data = cpu_to_le32(addr); 554 555 /* Make sure pointer to data buffer is set */ 556 wmb(); 557 558 skb_tx_timestamp(skb); 559 560 *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); 561 562 /* Increment index to point to the next BD */ 563 *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; 564 565 /* Get "info" of the next BD */ 566 info = &priv->txbd[*txbd_curr].info; 567 568 /* Check if if Tx BD ring is full - next BD is still owned by EMAC */ 569 if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) 570 netif_stop_queue(ndev); 571 572 arc_reg_set(priv, R_STATUS, TXPL_MASK); 573 574 return NETDEV_TX_OK; 575 } 576 577 static void arc_emac_set_address_internal(struct net_device *ndev) 578 { 579 struct arc_emac_priv *priv = netdev_priv(ndev); 580 unsigned int addr_low, addr_hi; 581 582 addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]); 583 addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]); 584 585 arc_reg_set(priv, R_ADDRL, addr_low); 586 arc_reg_set(priv, R_ADDRH, addr_hi); 587 } 588 589 /** 590 * arc_emac_set_address - Set the MAC address for this device. 591 * @ndev: Pointer to net_device structure. 592 * @p: 6 byte Address to be written as MAC address. 593 * 594 * This function copies the HW address from the sockaddr structure to the 595 * net_device structure and updates the address in HW. 596 * 597 * returns: -EBUSY if the net device is busy or 0 if the address is set 598 * successfully. 599 */ 600 static int arc_emac_set_address(struct net_device *ndev, void *p) 601 { 602 struct sockaddr *addr = p; 603 604 if (netif_running(ndev)) 605 return -EBUSY; 606 607 if (!is_valid_ether_addr(addr->sa_data)) 608 return -EADDRNOTAVAIL; 609 610 memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); 611 612 arc_emac_set_address_internal(ndev); 613 614 return 0; 615 } 616 617 static const struct net_device_ops arc_emac_netdev_ops = { 618 .ndo_open = arc_emac_open, 619 .ndo_stop = arc_emac_stop, 620 .ndo_start_xmit = arc_emac_tx, 621 .ndo_set_mac_address = arc_emac_set_address, 622 .ndo_get_stats = arc_emac_stats, 623 }; 624 625 static int arc_emac_probe(struct platform_device *pdev) 626 { 627 struct resource res_regs; 628 struct device_node *phy_node; 629 struct arc_emac_priv *priv; 630 struct net_device *ndev; 631 const char *mac_addr; 632 unsigned int id, clock_frequency, irq; 633 int err; 634 635 if (!pdev->dev.of_node) 636 return -ENODEV; 637 638 /* Get PHY from device tree */ 639 phy_node = of_parse_phandle(pdev->dev.of_node, "phy", 0); 640 if (!phy_node) { 641 dev_err(&pdev->dev, "failed to retrieve phy description from device tree\n"); 642 return -ENODEV; 643 } 644 645 /* Get EMAC registers base address from device tree */ 646 err = of_address_to_resource(pdev->dev.of_node, 0, &res_regs); 647 if (err) { 648 dev_err(&pdev->dev, "failed to retrieve registers base from device tree\n"); 649 return -ENODEV; 650 } 651 652 /* Get IRQ from device tree */ 653 irq = irq_of_parse_and_map(pdev->dev.of_node, 0); 654 if (!irq) { 655 dev_err(&pdev->dev, "failed to retrieve <irq> value from device tree\n"); 656 return -ENODEV; 657 } 658 659 ndev = alloc_etherdev(sizeof(struct arc_emac_priv)); 660 if (!ndev) 661 return -ENOMEM; 662 663 platform_set_drvdata(pdev, ndev); 664 SET_NETDEV_DEV(ndev, &pdev->dev); 665 666 ndev->netdev_ops = &arc_emac_netdev_ops; 667 ndev->ethtool_ops = &arc_emac_ethtool_ops; 668 ndev->watchdog_timeo = TX_TIMEOUT; 669 /* FIXME :: no multicast support yet */ 670 ndev->flags &= ~IFF_MULTICAST; 671 672 priv = netdev_priv(ndev); 673 priv->dev = &pdev->dev; 674 priv->ndev = ndev; 675 676 priv->regs = devm_ioremap_resource(&pdev->dev, &res_regs); 677 if (IS_ERR(priv->regs)) { 678 err = PTR_ERR(priv->regs); 679 goto out_netdev; 680 } 681 dev_dbg(&pdev->dev, "Registers base address is 0x%p\n", priv->regs); 682 683 priv->clk = of_clk_get(pdev->dev.of_node, 0); 684 if (IS_ERR(priv->clk)) { 685 /* Get CPU clock frequency from device tree */ 686 if (of_property_read_u32(pdev->dev.of_node, "clock-frequency", 687 &clock_frequency)) { 688 dev_err(&pdev->dev, "failed to retrieve <clock-frequency> from device tree\n"); 689 err = -EINVAL; 690 goto out_netdev; 691 } 692 } else { 693 err = clk_prepare_enable(priv->clk); 694 if (err) { 695 dev_err(&pdev->dev, "failed to enable clock\n"); 696 goto out_clkget; 697 } 698 699 clock_frequency = clk_get_rate(priv->clk); 700 } 701 702 id = arc_reg_get(priv, R_ID); 703 704 /* Check for EMAC revision 5 or 7, magic number */ 705 if (!(id == 0x0005fd02 || id == 0x0007fd02)) { 706 dev_err(&pdev->dev, "ARC EMAC not detected, id=0x%x\n", id); 707 err = -ENODEV; 708 goto out_clken; 709 } 710 dev_info(&pdev->dev, "ARC EMAC detected with id: 0x%x\n", id); 711 712 /* Set poll rate so that it polls every 1 ms */ 713 arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); 714 715 ndev->irq = irq; 716 dev_info(&pdev->dev, "IRQ is %d\n", ndev->irq); 717 718 /* Register interrupt handler for device */ 719 err = devm_request_irq(&pdev->dev, ndev->irq, arc_emac_intr, 0, 720 ndev->name, ndev); 721 if (err) { 722 dev_err(&pdev->dev, "could not allocate IRQ\n"); 723 goto out_clken; 724 } 725 726 /* Get MAC address from device tree */ 727 mac_addr = of_get_mac_address(pdev->dev.of_node); 728 729 if (mac_addr) 730 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); 731 else 732 eth_hw_addr_random(ndev); 733 734 arc_emac_set_address_internal(ndev); 735 dev_info(&pdev->dev, "MAC address is now %pM\n", ndev->dev_addr); 736 737 /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ 738 priv->rxbd = dmam_alloc_coherent(&pdev->dev, RX_RING_SZ + TX_RING_SZ, 739 &priv->rxbd_dma, GFP_KERNEL); 740 741 if (!priv->rxbd) { 742 dev_err(&pdev->dev, "failed to allocate data buffers\n"); 743 err = -ENOMEM; 744 goto out_clken; 745 } 746 747 priv->txbd = priv->rxbd + RX_BD_NUM; 748 749 priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; 750 dev_dbg(&pdev->dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", 751 (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); 752 753 err = arc_mdio_probe(pdev, priv); 754 if (err) { 755 dev_err(&pdev->dev, "failed to probe MII bus\n"); 756 goto out_clken; 757 } 758 759 priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, 760 PHY_INTERFACE_MODE_MII); 761 if (!priv->phy_dev) { 762 dev_err(&pdev->dev, "of_phy_connect() failed\n"); 763 err = -ENODEV; 764 goto out_mdio; 765 } 766 767 dev_info(&pdev->dev, "connected to %s phy with id 0x%x\n", 768 priv->phy_dev->drv->name, priv->phy_dev->phy_id); 769 770 netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); 771 772 err = register_netdev(ndev); 773 if (err) { 774 dev_err(&pdev->dev, "failed to register network device\n"); 775 goto out_netif_api; 776 } 777 778 return 0; 779 780 out_netif_api: 781 netif_napi_del(&priv->napi); 782 phy_disconnect(priv->phy_dev); 783 priv->phy_dev = NULL; 784 out_mdio: 785 arc_mdio_remove(priv); 786 out_clken: 787 if (!IS_ERR(priv->clk)) 788 clk_disable_unprepare(priv->clk); 789 out_clkget: 790 if (!IS_ERR(priv->clk)) 791 clk_put(priv->clk); 792 out_netdev: 793 free_netdev(ndev); 794 return err; 795 } 796 797 static int arc_emac_remove(struct platform_device *pdev) 798 { 799 struct net_device *ndev = platform_get_drvdata(pdev); 800 struct arc_emac_priv *priv = netdev_priv(ndev); 801 802 phy_disconnect(priv->phy_dev); 803 priv->phy_dev = NULL; 804 arc_mdio_remove(priv); 805 unregister_netdev(ndev); 806 netif_napi_del(&priv->napi); 807 808 if (!IS_ERR(priv->clk)) { 809 clk_disable_unprepare(priv->clk); 810 clk_put(priv->clk); 811 } 812 813 free_netdev(ndev); 814 815 return 0; 816 } 817 818 static const struct of_device_id arc_emac_dt_ids[] = { 819 { .compatible = "snps,arc-emac" }, 820 { /* Sentinel */ } 821 }; 822 MODULE_DEVICE_TABLE(of, arc_emac_dt_ids); 823 824 static struct platform_driver arc_emac_driver = { 825 .probe = arc_emac_probe, 826 .remove = arc_emac_remove, 827 .driver = { 828 .name = DRV_NAME, 829 .owner = THIS_MODULE, 830 .of_match_table = arc_emac_dt_ids, 831 }, 832 }; 833 834 module_platform_driver(arc_emac_driver); 835 836 MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); 837 MODULE_DESCRIPTION("ARC EMAC driver"); 838 MODULE_LICENSE("GPL"); 839