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/** 31 * arc_emac_tx_avail - Return the number of available slots in the tx ring. 32 * @priv: Pointer to ARC EMAC private data structure. 33 * 34 * returns: the number of slots available for transmission in tx the ring. 35 */ 36static inline int arc_emac_tx_avail(struct arc_emac_priv *priv) 37{ 38 return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM; 39} 40 41/** 42 * arc_emac_adjust_link - Adjust the PHY link duplex. 43 * @ndev: Pointer to the net_device structure. 44 * 45 * This function is called to change the duplex setting after auto negotiation 46 * is done by the PHY. 47 */ 48static void arc_emac_adjust_link(struct net_device *ndev) 49{ 50 struct arc_emac_priv *priv = netdev_priv(ndev); 51 struct phy_device *phy_dev = priv->phy_dev; 52 unsigned int reg, state_changed = 0; 53 54 if (priv->link != phy_dev->link) { 55 priv->link = phy_dev->link; 56 state_changed = 1; 57 } 58 59 if (priv->speed != phy_dev->speed) { 60 priv->speed = phy_dev->speed; 61 state_changed = 1; 62 if (priv->set_mac_speed) 63 priv->set_mac_speed(priv, priv->speed); 64 } 65 66 if (priv->duplex != phy_dev->duplex) { 67 reg = arc_reg_get(priv, R_CTRL); 68 69 if (DUPLEX_FULL == phy_dev->duplex) 70 reg |= ENFL_MASK; 71 else 72 reg &= ~ENFL_MASK; 73 74 arc_reg_set(priv, R_CTRL, reg); 75 priv->duplex = phy_dev->duplex; 76 state_changed = 1; 77 } 78 79 if (state_changed) 80 phy_print_status(phy_dev); 81} 82 83/** 84 * arc_emac_get_settings - Get PHY settings. 85 * @ndev: Pointer to net_device structure. 86 * @cmd: Pointer to ethtool_cmd structure. 87 * 88 * This implements ethtool command for getting PHY settings. If PHY could 89 * not be found, the function returns -ENODEV. This function calls the 90 * relevant PHY ethtool API to get the PHY settings. 91 * Issue "ethtool ethX" under linux prompt to execute this function. 92 */ 93static int arc_emac_get_settings(struct net_device *ndev, 94 struct ethtool_cmd *cmd) 95{ 96 struct arc_emac_priv *priv = netdev_priv(ndev); 97 98 return phy_ethtool_gset(priv->phy_dev, cmd); 99} 100 101/** 102 * arc_emac_set_settings - Set PHY settings as passed in the argument. 103 * @ndev: Pointer to net_device structure. 104 * @cmd: Pointer to ethtool_cmd structure. 105 * 106 * This implements ethtool command for setting various PHY settings. If PHY 107 * could not be found, the function returns -ENODEV. This function calls the 108 * relevant PHY ethtool API to set the PHY. 109 * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this 110 * function. 111 */ 112static int arc_emac_set_settings(struct net_device *ndev, 113 struct ethtool_cmd *cmd) 114{ 115 struct arc_emac_priv *priv = netdev_priv(ndev); 116 117 if (!capable(CAP_NET_ADMIN)) 118 return -EPERM; 119 120 return phy_ethtool_sset(priv->phy_dev, cmd); 121} 122 123/** 124 * arc_emac_get_drvinfo - Get EMAC driver information. 125 * @ndev: Pointer to net_device structure. 126 * @info: Pointer to ethtool_drvinfo structure. 127 * 128 * This implements ethtool command for getting the driver information. 129 * Issue "ethtool -i ethX" under linux prompt to execute this function. 130 */ 131static void arc_emac_get_drvinfo(struct net_device *ndev, 132 struct ethtool_drvinfo *info) 133{ 134 struct arc_emac_priv *priv = netdev_priv(ndev); 135 136 strlcpy(info->driver, priv->drv_name, sizeof(info->driver)); 137 strlcpy(info->version, priv->drv_version, sizeof(info->version)); 138} 139 140static const struct ethtool_ops arc_emac_ethtool_ops = { 141 .get_settings = arc_emac_get_settings, 142 .set_settings = arc_emac_set_settings, 143 .get_drvinfo = arc_emac_get_drvinfo, 144 .get_link = ethtool_op_get_link, 145}; 146 147#define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK) 148 149/** 150 * arc_emac_tx_clean - clears processed by EMAC Tx BDs. 151 * @ndev: Pointer to the network device. 152 */ 153static void arc_emac_tx_clean(struct net_device *ndev) 154{ 155 struct arc_emac_priv *priv = netdev_priv(ndev); 156 struct net_device_stats *stats = &ndev->stats; 157 unsigned int i; 158 159 for (i = 0; i < TX_BD_NUM; i++) { 160 unsigned int *txbd_dirty = &priv->txbd_dirty; 161 struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty]; 162 struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty]; 163 struct sk_buff *skb = tx_buff->skb; 164 unsigned int info = le32_to_cpu(txbd->info); 165 166 if ((info & FOR_EMAC) || !txbd->data) 167 break; 168 169 if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) { 170 stats->tx_errors++; 171 stats->tx_dropped++; 172 173 if (info & DEFR) 174 stats->tx_carrier_errors++; 175 176 if (info & LTCL) 177 stats->collisions++; 178 179 if (info & UFLO) 180 stats->tx_fifo_errors++; 181 } else if (likely(info & FIRST_OR_LAST_MASK)) { 182 stats->tx_packets++; 183 stats->tx_bytes += skb->len; 184 } 185 186 dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), 187 dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); 188 189 /* return the sk_buff to system */ 190 dev_kfree_skb_irq(skb); 191 192 txbd->data = 0; 193 txbd->info = 0; 194 195 *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; 196 } 197 198 /* Ensure that txbd_dirty is visible to tx() before checking 199 * for queue stopped. 200 */ 201 smp_mb(); 202 203 if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv)) 204 netif_wake_queue(ndev); 205} 206 207/** 208 * arc_emac_rx - processing of Rx packets. 209 * @ndev: Pointer to the network device. 210 * @budget: How many BDs to process on 1 call. 211 * 212 * returns: Number of processed BDs 213 * 214 * Iterate through Rx BDs and deliver received packages to upper layer. 215 */ 216static int arc_emac_rx(struct net_device *ndev, int budget) 217{ 218 struct arc_emac_priv *priv = netdev_priv(ndev); 219 unsigned int work_done; 220 221 for (work_done = 0; work_done < budget; work_done++) { 222 unsigned int *last_rx_bd = &priv->last_rx_bd; 223 struct net_device_stats *stats = &ndev->stats; 224 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; 225 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; 226 unsigned int pktlen, info = le32_to_cpu(rxbd->info); 227 struct sk_buff *skb; 228 dma_addr_t addr; 229 230 if (unlikely((info & OWN_MASK) == FOR_EMAC)) 231 break; 232 233 /* Make a note that we saw a packet at this BD. 234 * So next time, driver starts from this + 1 235 */ 236 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; 237 238 if (unlikely((info & FIRST_OR_LAST_MASK) != 239 FIRST_OR_LAST_MASK)) { 240 /* We pre-allocate buffers of MTU size so incoming 241 * packets won't be split/chained. 242 */ 243 if (net_ratelimit()) 244 netdev_err(ndev, "incomplete packet received\n"); 245 246 /* Return ownership to EMAC */ 247 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 248 stats->rx_errors++; 249 stats->rx_length_errors++; 250 continue; 251 } 252 253 pktlen = info & LEN_MASK; 254 stats->rx_packets++; 255 stats->rx_bytes += pktlen; 256 skb = rx_buff->skb; 257 skb_put(skb, pktlen); 258 skb->dev = ndev; 259 skb->protocol = eth_type_trans(skb, ndev); 260 261 dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), 262 dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); 263 264 /* Prepare the BD for next cycle */ 265 rx_buff->skb = netdev_alloc_skb_ip_align(ndev, 266 EMAC_BUFFER_SIZE); 267 if (unlikely(!rx_buff->skb)) { 268 stats->rx_errors++; 269 /* Because receive_skb is below, increment rx_dropped */ 270 stats->rx_dropped++; 271 continue; 272 } 273 274 /* receive_skb only if new skb was allocated to avoid holes */ 275 netif_receive_skb(skb); 276 277 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, 278 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 279 if (dma_mapping_error(&ndev->dev, addr)) { 280 if (net_ratelimit()) 281 netdev_err(ndev, "cannot dma map\n"); 282 dev_kfree_skb(rx_buff->skb); 283 stats->rx_errors++; 284 continue; 285 } 286 dma_unmap_addr_set(rx_buff, addr, addr); 287 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 288 289 rxbd->data = cpu_to_le32(addr); 290 291 /* Make sure pointer to data buffer is set */ 292 wmb(); 293 294 /* Return ownership to EMAC */ 295 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 296 } 297 298 return work_done; 299} 300 301/** 302 * arc_emac_poll - NAPI poll handler. 303 * @napi: Pointer to napi_struct structure. 304 * @budget: How many BDs to process on 1 call. 305 * 306 * returns: Number of processed BDs 307 */ 308static int arc_emac_poll(struct napi_struct *napi, int budget) 309{ 310 struct net_device *ndev = napi->dev; 311 struct arc_emac_priv *priv = netdev_priv(ndev); 312 unsigned int work_done; 313 314 arc_emac_tx_clean(ndev); 315 316 work_done = arc_emac_rx(ndev, budget); 317 if (work_done < budget) { 318 napi_complete(napi); 319 arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); 320 } 321 322 return work_done; 323} 324 325/** 326 * arc_emac_intr - Global interrupt handler for EMAC. 327 * @irq: irq number. 328 * @dev_instance: device instance. 329 * 330 * returns: IRQ_HANDLED for all cases. 331 * 332 * ARC EMAC has only 1 interrupt line, and depending on bits raised in 333 * STATUS register we may tell what is a reason for interrupt to fire. 334 */ 335static irqreturn_t arc_emac_intr(int irq, void *dev_instance) 336{ 337 struct net_device *ndev = dev_instance; 338 struct arc_emac_priv *priv = netdev_priv(ndev); 339 struct net_device_stats *stats = &ndev->stats; 340 unsigned int status; 341 342 status = arc_reg_get(priv, R_STATUS); 343 status &= ~MDIO_MASK; 344 345 /* Reset all flags except "MDIO complete" */ 346 arc_reg_set(priv, R_STATUS, status); 347 348 if (status & (RXINT_MASK | TXINT_MASK)) { 349 if (likely(napi_schedule_prep(&priv->napi))) { 350 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); 351 __napi_schedule(&priv->napi); 352 } 353 } 354 355 if (status & ERR_MASK) { 356 /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding 357 * 8-bit error counter overrun. 358 */ 359 360 if (status & MSER_MASK) { 361 stats->rx_missed_errors += 0x100; 362 stats->rx_errors += 0x100; 363 } 364 365 if (status & RXCR_MASK) { 366 stats->rx_crc_errors += 0x100; 367 stats->rx_errors += 0x100; 368 } 369 370 if (status & RXFR_MASK) { 371 stats->rx_frame_errors += 0x100; 372 stats->rx_errors += 0x100; 373 } 374 375 if (status & RXFL_MASK) { 376 stats->rx_over_errors += 0x100; 377 stats->rx_errors += 0x100; 378 } 379 } 380 381 return IRQ_HANDLED; 382} 383 384#ifdef CONFIG_NET_POLL_CONTROLLER 385static void arc_emac_poll_controller(struct net_device *dev) 386{ 387 disable_irq(dev->irq); 388 arc_emac_intr(dev->irq, dev); 389 enable_irq(dev->irq); 390} 391#endif 392 393/** 394 * arc_emac_open - Open the network device. 395 * @ndev: Pointer to the network device. 396 * 397 * returns: 0, on success or non-zero error value on failure. 398 * 399 * This function sets the MAC address, requests and enables an IRQ 400 * for the EMAC device and starts the Tx queue. 401 * It also connects to the phy device. 402 */ 403static int arc_emac_open(struct net_device *ndev) 404{ 405 struct arc_emac_priv *priv = netdev_priv(ndev); 406 struct phy_device *phy_dev = priv->phy_dev; 407 int i; 408 409 phy_dev->autoneg = AUTONEG_ENABLE; 410 phy_dev->speed = 0; 411 phy_dev->duplex = 0; 412 phy_dev->advertising &= phy_dev->supported; 413 414 priv->last_rx_bd = 0; 415 416 /* Allocate and set buffers for Rx BD's */ 417 for (i = 0; i < RX_BD_NUM; i++) { 418 dma_addr_t addr; 419 unsigned int *last_rx_bd = &priv->last_rx_bd; 420 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; 421 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; 422 423 rx_buff->skb = netdev_alloc_skb_ip_align(ndev, 424 EMAC_BUFFER_SIZE); 425 if (unlikely(!rx_buff->skb)) 426 return -ENOMEM; 427 428 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, 429 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 430 if (dma_mapping_error(&ndev->dev, addr)) { 431 netdev_err(ndev, "cannot dma map\n"); 432 dev_kfree_skb(rx_buff->skb); 433 return -ENOMEM; 434 } 435 dma_unmap_addr_set(rx_buff, addr, addr); 436 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 437 438 rxbd->data = cpu_to_le32(addr); 439 440 /* Make sure pointer to data buffer is set */ 441 wmb(); 442 443 /* Return ownership to EMAC */ 444 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 445 446 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; 447 } 448 449 /* Clean Tx BD's */ 450 memset(priv->txbd, 0, TX_RING_SZ); 451 452 /* Initialize logical address filter */ 453 arc_reg_set(priv, R_LAFL, 0); 454 arc_reg_set(priv, R_LAFH, 0); 455 456 /* Set BD ring pointers for device side */ 457 arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma); 458 arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma); 459 460 /* Enable interrupts */ 461 arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); 462 463 /* Set CONTROL */ 464 arc_reg_set(priv, R_CTRL, 465 (RX_BD_NUM << 24) | /* RX BD table length */ 466 (TX_BD_NUM << 16) | /* TX BD table length */ 467 TXRN_MASK | RXRN_MASK); 468 469 napi_enable(&priv->napi); 470 471 /* Enable EMAC */ 472 arc_reg_or(priv, R_CTRL, EN_MASK); 473 474 phy_start_aneg(priv->phy_dev); 475 476 netif_start_queue(ndev); 477 478 return 0; 479} 480 481/** 482 * arc_emac_set_rx_mode - Change the receive filtering mode. 483 * @ndev: Pointer to the network device. 484 * 485 * This function enables/disables promiscuous or all-multicast mode 486 * and updates the multicast filtering list of the network device. 487 */ 488static void arc_emac_set_rx_mode(struct net_device *ndev) 489{ 490 struct arc_emac_priv *priv = netdev_priv(ndev); 491 492 if (ndev->flags & IFF_PROMISC) { 493 arc_reg_or(priv, R_CTRL, PROM_MASK); 494 } else { 495 arc_reg_clr(priv, R_CTRL, PROM_MASK); 496 497 if (ndev->flags & IFF_ALLMULTI) { 498 arc_reg_set(priv, R_LAFL, ~0); 499 arc_reg_set(priv, R_LAFH, ~0); 500 } else { 501 struct netdev_hw_addr *ha; 502 unsigned int filter[2] = { 0, 0 }; 503 int bit; 504 505 netdev_for_each_mc_addr(ha, ndev) { 506 bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26; 507 filter[bit >> 5] |= 1 << (bit & 31); 508 } 509 510 arc_reg_set(priv, R_LAFL, filter[0]); 511 arc_reg_set(priv, R_LAFH, filter[1]); 512 } 513 } 514} 515 516/** 517 * arc_emac_stop - Close the network device. 518 * @ndev: Pointer to the network device. 519 * 520 * This function stops the Tx queue, disables interrupts and frees the IRQ for 521 * the EMAC device. 522 * It also disconnects the PHY device associated with the EMAC device. 523 */ 524static int arc_emac_stop(struct net_device *ndev) 525{ 526 struct arc_emac_priv *priv = netdev_priv(ndev); 527 528 napi_disable(&priv->napi); 529 netif_stop_queue(ndev); 530 531 /* Disable interrupts */ 532 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); 533 534 /* Disable EMAC */ 535 arc_reg_clr(priv, R_CTRL, EN_MASK); 536 537 return 0; 538} 539 540/** 541 * arc_emac_stats - Get system network statistics. 542 * @ndev: Pointer to net_device structure. 543 * 544 * Returns the address of the device statistics structure. 545 * Statistics are updated in interrupt handler. 546 */ 547static struct net_device_stats *arc_emac_stats(struct net_device *ndev) 548{ 549 struct arc_emac_priv *priv = netdev_priv(ndev); 550 struct net_device_stats *stats = &ndev->stats; 551 unsigned long miss, rxerr; 552 u8 rxcrc, rxfram, rxoflow; 553 554 rxerr = arc_reg_get(priv, R_RXERR); 555 miss = arc_reg_get(priv, R_MISS); 556 557 rxcrc = rxerr; 558 rxfram = rxerr >> 8; 559 rxoflow = rxerr >> 16; 560 561 stats->rx_errors += miss; 562 stats->rx_errors += rxcrc + rxfram + rxoflow; 563 564 stats->rx_over_errors += rxoflow; 565 stats->rx_frame_errors += rxfram; 566 stats->rx_crc_errors += rxcrc; 567 stats->rx_missed_errors += miss; 568 569 return stats; 570} 571 572/** 573 * arc_emac_tx - Starts the data transmission. 574 * @skb: sk_buff pointer that contains data to be Transmitted. 575 * @ndev: Pointer to net_device structure. 576 * 577 * returns: NETDEV_TX_OK, on success 578 * NETDEV_TX_BUSY, if any of the descriptors are not free. 579 * 580 * This function is invoked from upper layers to initiate transmission. 581 */ 582static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) 583{ 584 struct arc_emac_priv *priv = netdev_priv(ndev); 585 unsigned int len, *txbd_curr = &priv->txbd_curr; 586 struct net_device_stats *stats = &ndev->stats; 587 __le32 *info = &priv->txbd[*txbd_curr].info; 588 dma_addr_t addr; 589 590 if (skb_padto(skb, ETH_ZLEN)) 591 return NETDEV_TX_OK; 592 593 len = max_t(unsigned int, ETH_ZLEN, skb->len); 594 595 if (unlikely(!arc_emac_tx_avail(priv))) { 596 netif_stop_queue(ndev); 597 netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n"); 598 return NETDEV_TX_BUSY; 599 } 600 601 addr = dma_map_single(&ndev->dev, (void *)skb->data, len, 602 DMA_TO_DEVICE); 603 604 if (unlikely(dma_mapping_error(&ndev->dev, addr))) { 605 stats->tx_dropped++; 606 stats->tx_errors++; 607 dev_kfree_skb(skb); 608 return NETDEV_TX_OK; 609 } 610 dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); 611 dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); 612 613 priv->tx_buff[*txbd_curr].skb = skb; 614 priv->txbd[*txbd_curr].data = cpu_to_le32(addr); 615 616 /* Make sure pointer to data buffer is set */ 617 wmb(); 618 619 skb_tx_timestamp(skb); 620 621 *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); 622 623 /* Increment index to point to the next BD */ 624 *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; 625 626 /* Ensure that tx_clean() sees the new txbd_curr before 627 * checking the queue status. This prevents an unneeded wake 628 * of the queue in tx_clean(). 629 */ 630 smp_mb(); 631 632 if (!arc_emac_tx_avail(priv)) { 633 netif_stop_queue(ndev); 634 /* Refresh tx_dirty */ 635 smp_mb(); 636 if (arc_emac_tx_avail(priv)) 637 netif_start_queue(ndev); 638 } 639 640 arc_reg_set(priv, R_STATUS, TXPL_MASK); 641 642 return NETDEV_TX_OK; 643} 644 645static void arc_emac_set_address_internal(struct net_device *ndev) 646{ 647 struct arc_emac_priv *priv = netdev_priv(ndev); 648 unsigned int addr_low, addr_hi; 649 650 addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]); 651 addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]); 652 653 arc_reg_set(priv, R_ADDRL, addr_low); 654 arc_reg_set(priv, R_ADDRH, addr_hi); 655} 656 657/** 658 * arc_emac_set_address - Set the MAC address for this device. 659 * @ndev: Pointer to net_device structure. 660 * @p: 6 byte Address to be written as MAC address. 661 * 662 * This function copies the HW address from the sockaddr structure to the 663 * net_device structure and updates the address in HW. 664 * 665 * returns: -EBUSY if the net device is busy or 0 if the address is set 666 * successfully. 667 */ 668static int arc_emac_set_address(struct net_device *ndev, void *p) 669{ 670 struct sockaddr *addr = p; 671 672 if (netif_running(ndev)) 673 return -EBUSY; 674 675 if (!is_valid_ether_addr(addr->sa_data)) 676 return -EADDRNOTAVAIL; 677 678 memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); 679 680 arc_emac_set_address_internal(ndev); 681 682 return 0; 683} 684 685static const struct net_device_ops arc_emac_netdev_ops = { 686 .ndo_open = arc_emac_open, 687 .ndo_stop = arc_emac_stop, 688 .ndo_start_xmit = arc_emac_tx, 689 .ndo_set_mac_address = arc_emac_set_address, 690 .ndo_get_stats = arc_emac_stats, 691 .ndo_set_rx_mode = arc_emac_set_rx_mode, 692#ifdef CONFIG_NET_POLL_CONTROLLER 693 .ndo_poll_controller = arc_emac_poll_controller, 694#endif 695}; 696 697int arc_emac_probe(struct net_device *ndev, int interface) 698{ 699 struct device *dev = ndev->dev.parent; 700 struct resource res_regs; 701 struct device_node *phy_node; 702 struct arc_emac_priv *priv; 703 const char *mac_addr; 704 unsigned int id, clock_frequency, irq; 705 int err; 706 707 708 /* Get PHY from device tree */ 709 phy_node = of_parse_phandle(dev->of_node, "phy", 0); 710 if (!phy_node) { 711 dev_err(dev, "failed to retrieve phy description from device tree\n"); 712 return -ENODEV; 713 } 714 715 /* Get EMAC registers base address from device tree */ 716 err = of_address_to_resource(dev->of_node, 0, &res_regs); 717 if (err) { 718 dev_err(dev, "failed to retrieve registers base from device tree\n"); 719 return -ENODEV; 720 } 721 722 /* Get IRQ from device tree */ 723 irq = irq_of_parse_and_map(dev->of_node, 0); 724 if (!irq) { 725 dev_err(dev, "failed to retrieve <irq> value from device tree\n"); 726 return -ENODEV; 727 } 728 729 730 ndev->netdev_ops = &arc_emac_netdev_ops; 731 ndev->ethtool_ops = &arc_emac_ethtool_ops; 732 ndev->watchdog_timeo = TX_TIMEOUT; 733 /* FIXME :: no multicast support yet */ 734 ndev->flags &= ~IFF_MULTICAST; 735 736 priv = netdev_priv(ndev); 737 priv->dev = dev; 738 739 priv->regs = devm_ioremap_resource(dev, &res_regs); 740 if (IS_ERR(priv->regs)) { 741 return PTR_ERR(priv->regs); 742 } 743 dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs); 744 745 if (priv->clk) { 746 err = clk_prepare_enable(priv->clk); 747 if (err) { 748 dev_err(dev, "failed to enable clock\n"); 749 return err; 750 } 751 752 clock_frequency = clk_get_rate(priv->clk); 753 } else { 754 /* Get CPU clock frequency from device tree */ 755 if (of_property_read_u32(dev->of_node, "clock-frequency", 756 &clock_frequency)) { 757 dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n"); 758 return -EINVAL; 759 } 760 } 761 762 id = arc_reg_get(priv, R_ID); 763 764 /* Check for EMAC revision 5 or 7, magic number */ 765 if (!(id == 0x0005fd02 || id == 0x0007fd02)) { 766 dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id); 767 err = -ENODEV; 768 goto out_clken; 769 } 770 dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id); 771 772 /* Set poll rate so that it polls every 1 ms */ 773 arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); 774 775 ndev->irq = irq; 776 dev_info(dev, "IRQ is %d\n", ndev->irq); 777 778 /* Register interrupt handler for device */ 779 err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0, 780 ndev->name, ndev); 781 if (err) { 782 dev_err(dev, "could not allocate IRQ\n"); 783 goto out_clken; 784 } 785 786 /* Get MAC address from device tree */ 787 mac_addr = of_get_mac_address(dev->of_node); 788 789 if (mac_addr) 790 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); 791 else 792 eth_hw_addr_random(ndev); 793 794 arc_emac_set_address_internal(ndev); 795 dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); 796 797 /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ 798 priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ, 799 &priv->rxbd_dma, GFP_KERNEL); 800 801 if (!priv->rxbd) { 802 dev_err(dev, "failed to allocate data buffers\n"); 803 err = -ENOMEM; 804 goto out_clken; 805 } 806 807 priv->txbd = priv->rxbd + RX_BD_NUM; 808 809 priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; 810 dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", 811 (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); 812 813 err = arc_mdio_probe(priv); 814 if (err) { 815 dev_err(dev, "failed to probe MII bus\n"); 816 goto out_clken; 817 } 818 819 priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, 820 interface); 821 if (!priv->phy_dev) { 822 dev_err(dev, "of_phy_connect() failed\n"); 823 err = -ENODEV; 824 goto out_mdio; 825 } 826 827 dev_info(dev, "connected to %s phy with id 0x%x\n", 828 priv->phy_dev->drv->name, priv->phy_dev->phy_id); 829 830 netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); 831 832 err = register_netdev(ndev); 833 if (err) { 834 dev_err(dev, "failed to register network device\n"); 835 goto out_netif_api; 836 } 837 838 return 0; 839 840out_netif_api: 841 netif_napi_del(&priv->napi); 842 phy_disconnect(priv->phy_dev); 843 priv->phy_dev = NULL; 844out_mdio: 845 arc_mdio_remove(priv); 846out_clken: 847 if (priv->clk) 848 clk_disable_unprepare(priv->clk); 849 return err; 850} 851EXPORT_SYMBOL_GPL(arc_emac_probe); 852 853int arc_emac_remove(struct net_device *ndev) 854{ 855 struct arc_emac_priv *priv = netdev_priv(ndev); 856 857 phy_disconnect(priv->phy_dev); 858 priv->phy_dev = NULL; 859 arc_mdio_remove(priv); 860 unregister_netdev(ndev); 861 netif_napi_del(&priv->napi); 862 863 if (!IS_ERR(priv->clk)) { 864 clk_disable_unprepare(priv->clk); 865 } 866 867 868 return 0; 869} 870EXPORT_SYMBOL_GPL(arc_emac_remove); 871 872MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); 873MODULE_DESCRIPTION("ARC EMAC driver"); 874MODULE_LICENSE("GPL"); 875