1 /* 2 * This program is free software; you can redistribute it and/or modify it 3 * under the terms of the GNU General Public License version 2 as published 4 * by the Free Software Foundation. 5 * 6 * This program is distributed in the hope that it will be useful, 7 * but WITHOUT ANY WARRANTY; without even the implied warranty of 8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 9 * GNU General Public License for more details. 10 * 11 * You should have received a copy of the GNU General Public License 12 * along with this program; if not, see <http://www.gnu.org/licenses/>. 13 * 14 * Copyright (C) 2011 John Crispin <blogic@openwrt.org> 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/slab.h> 19 #include <linux/errno.h> 20 #include <linux/types.h> 21 #include <linux/interrupt.h> 22 #include <linux/uaccess.h> 23 #include <linux/in.h> 24 #include <linux/netdevice.h> 25 #include <linux/etherdevice.h> 26 #include <linux/phy.h> 27 #include <linux/ip.h> 28 #include <linux/tcp.h> 29 #include <linux/skbuff.h> 30 #include <linux/mm.h> 31 #include <linux/platform_device.h> 32 #include <linux/ethtool.h> 33 #include <linux/init.h> 34 #include <linux/delay.h> 35 #include <linux/io.h> 36 #include <linux/dma-mapping.h> 37 #include <linux/module.h> 38 39 #include <asm/checksum.h> 40 41 #include <lantiq_soc.h> 42 #include <xway_dma.h> 43 #include <lantiq_platform.h> 44 45 #define LTQ_ETOP_MDIO 0x11804 46 #define MDIO_REQUEST 0x80000000 47 #define MDIO_READ 0x40000000 48 #define MDIO_ADDR_MASK 0x1f 49 #define MDIO_ADDR_OFFSET 0x15 50 #define MDIO_REG_MASK 0x1f 51 #define MDIO_REG_OFFSET 0x10 52 #define MDIO_VAL_MASK 0xffff 53 54 #define PPE32_CGEN 0x800 55 #define LQ_PPE32_ENET_MAC_CFG 0x1840 56 57 #define LTQ_ETOP_ENETS0 0x11850 58 #define LTQ_ETOP_MAC_DA0 0x1186C 59 #define LTQ_ETOP_MAC_DA1 0x11870 60 #define LTQ_ETOP_CFG 0x16020 61 #define LTQ_ETOP_IGPLEN 0x16080 62 63 #define MAX_DMA_CHAN 0x8 64 #define MAX_DMA_CRC_LEN 0x4 65 #define MAX_DMA_DATA_LEN 0x600 66 67 #define ETOP_FTCU BIT(28) 68 #define ETOP_MII_MASK 0xf 69 #define ETOP_MII_NORMAL 0xd 70 #define ETOP_MII_REVERSE 0xe 71 #define ETOP_PLEN_UNDER 0x40 72 #define ETOP_CGEN 0x800 73 74 /* use 2 static channels for TX/RX */ 75 #define LTQ_ETOP_TX_CHANNEL 1 76 #define LTQ_ETOP_RX_CHANNEL 6 77 #define IS_TX(x) (x == LTQ_ETOP_TX_CHANNEL) 78 #define IS_RX(x) (x == LTQ_ETOP_RX_CHANNEL) 79 80 #define ltq_etop_r32(x) ltq_r32(ltq_etop_membase + (x)) 81 #define ltq_etop_w32(x, y) ltq_w32(x, ltq_etop_membase + (y)) 82 #define ltq_etop_w32_mask(x, y, z) \ 83 ltq_w32_mask(x, y, ltq_etop_membase + (z)) 84 85 #define DRV_VERSION "1.0" 86 87 static void __iomem *ltq_etop_membase; 88 89 struct ltq_etop_chan { 90 int idx; 91 int tx_free; 92 struct net_device *netdev; 93 struct napi_struct napi; 94 struct ltq_dma_channel dma; 95 struct sk_buff *skb[LTQ_DESC_NUM]; 96 }; 97 98 struct ltq_etop_priv { 99 struct net_device *netdev; 100 struct platform_device *pdev; 101 struct ltq_eth_data *pldata; 102 struct resource *res; 103 104 struct mii_bus *mii_bus; 105 struct phy_device *phydev; 106 107 struct ltq_etop_chan ch[MAX_DMA_CHAN]; 108 int tx_free[MAX_DMA_CHAN >> 1]; 109 110 spinlock_t lock; 111 }; 112 113 static int 114 ltq_etop_alloc_skb(struct ltq_etop_chan *ch) 115 { 116 ch->skb[ch->dma.desc] = netdev_alloc_skb(ch->netdev, MAX_DMA_DATA_LEN); 117 if (!ch->skb[ch->dma.desc]) 118 return -ENOMEM; 119 ch->dma.desc_base[ch->dma.desc].addr = dma_map_single(NULL, 120 ch->skb[ch->dma.desc]->data, MAX_DMA_DATA_LEN, 121 DMA_FROM_DEVICE); 122 ch->dma.desc_base[ch->dma.desc].addr = 123 CPHYSADDR(ch->skb[ch->dma.desc]->data); 124 ch->dma.desc_base[ch->dma.desc].ctl = 125 LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) | 126 MAX_DMA_DATA_LEN; 127 skb_reserve(ch->skb[ch->dma.desc], NET_IP_ALIGN); 128 return 0; 129 } 130 131 static void 132 ltq_etop_hw_receive(struct ltq_etop_chan *ch) 133 { 134 struct ltq_etop_priv *priv = netdev_priv(ch->netdev); 135 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc]; 136 struct sk_buff *skb = ch->skb[ch->dma.desc]; 137 int len = (desc->ctl & LTQ_DMA_SIZE_MASK) - MAX_DMA_CRC_LEN; 138 unsigned long flags; 139 140 spin_lock_irqsave(&priv->lock, flags); 141 if (ltq_etop_alloc_skb(ch)) { 142 netdev_err(ch->netdev, 143 "failed to allocate new rx buffer, stopping DMA\n"); 144 ltq_dma_close(&ch->dma); 145 } 146 ch->dma.desc++; 147 ch->dma.desc %= LTQ_DESC_NUM; 148 spin_unlock_irqrestore(&priv->lock, flags); 149 150 skb_put(skb, len); 151 skb->protocol = eth_type_trans(skb, ch->netdev); 152 netif_receive_skb(skb); 153 } 154 155 static int 156 ltq_etop_poll_rx(struct napi_struct *napi, int budget) 157 { 158 struct ltq_etop_chan *ch = container_of(napi, 159 struct ltq_etop_chan, napi); 160 int rx = 0; 161 int complete = 0; 162 163 while ((rx < budget) && !complete) { 164 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc]; 165 166 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) { 167 ltq_etop_hw_receive(ch); 168 rx++; 169 } else { 170 complete = 1; 171 } 172 } 173 if (complete || !rx) { 174 napi_complete(&ch->napi); 175 ltq_dma_ack_irq(&ch->dma); 176 } 177 return rx; 178 } 179 180 static int 181 ltq_etop_poll_tx(struct napi_struct *napi, int budget) 182 { 183 struct ltq_etop_chan *ch = 184 container_of(napi, struct ltq_etop_chan, napi); 185 struct ltq_etop_priv *priv = netdev_priv(ch->netdev); 186 struct netdev_queue *txq = 187 netdev_get_tx_queue(ch->netdev, ch->idx >> 1); 188 unsigned long flags; 189 190 spin_lock_irqsave(&priv->lock, flags); 191 while ((ch->dma.desc_base[ch->tx_free].ctl & 192 (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) { 193 dev_kfree_skb_any(ch->skb[ch->tx_free]); 194 ch->skb[ch->tx_free] = NULL; 195 memset(&ch->dma.desc_base[ch->tx_free], 0, 196 sizeof(struct ltq_dma_desc)); 197 ch->tx_free++; 198 ch->tx_free %= LTQ_DESC_NUM; 199 } 200 spin_unlock_irqrestore(&priv->lock, flags); 201 202 if (netif_tx_queue_stopped(txq)) 203 netif_tx_start_queue(txq); 204 napi_complete(&ch->napi); 205 ltq_dma_ack_irq(&ch->dma); 206 return 1; 207 } 208 209 static irqreturn_t 210 ltq_etop_dma_irq(int irq, void *_priv) 211 { 212 struct ltq_etop_priv *priv = _priv; 213 int ch = irq - LTQ_DMA_CH0_INT; 214 215 napi_schedule(&priv->ch[ch].napi); 216 return IRQ_HANDLED; 217 } 218 219 static void 220 ltq_etop_free_channel(struct net_device *dev, struct ltq_etop_chan *ch) 221 { 222 struct ltq_etop_priv *priv = netdev_priv(dev); 223 224 ltq_dma_free(&ch->dma); 225 if (ch->dma.irq) 226 free_irq(ch->dma.irq, priv); 227 if (IS_RX(ch->idx)) { 228 int desc; 229 for (desc = 0; desc < LTQ_DESC_NUM; desc++) 230 dev_kfree_skb_any(ch->skb[ch->dma.desc]); 231 } 232 } 233 234 static void 235 ltq_etop_hw_exit(struct net_device *dev) 236 { 237 struct ltq_etop_priv *priv = netdev_priv(dev); 238 int i; 239 240 ltq_pmu_disable(PMU_PPE); 241 for (i = 0; i < MAX_DMA_CHAN; i++) 242 if (IS_TX(i) || IS_RX(i)) 243 ltq_etop_free_channel(dev, &priv->ch[i]); 244 } 245 246 static int 247 ltq_etop_hw_init(struct net_device *dev) 248 { 249 struct ltq_etop_priv *priv = netdev_priv(dev); 250 int i; 251 252 ltq_pmu_enable(PMU_PPE); 253 254 switch (priv->pldata->mii_mode) { 255 case PHY_INTERFACE_MODE_RMII: 256 ltq_etop_w32_mask(ETOP_MII_MASK, 257 ETOP_MII_REVERSE, LTQ_ETOP_CFG); 258 break; 259 260 case PHY_INTERFACE_MODE_MII: 261 ltq_etop_w32_mask(ETOP_MII_MASK, 262 ETOP_MII_NORMAL, LTQ_ETOP_CFG); 263 break; 264 265 default: 266 netdev_err(dev, "unknown mii mode %d\n", 267 priv->pldata->mii_mode); 268 return -ENOTSUPP; 269 } 270 271 /* enable crc generation */ 272 ltq_etop_w32(PPE32_CGEN, LQ_PPE32_ENET_MAC_CFG); 273 274 ltq_dma_init_port(DMA_PORT_ETOP); 275 276 for (i = 0; i < MAX_DMA_CHAN; i++) { 277 int irq = LTQ_DMA_CH0_INT + i; 278 struct ltq_etop_chan *ch = &priv->ch[i]; 279 280 ch->idx = ch->dma.nr = i; 281 282 if (IS_TX(i)) { 283 ltq_dma_alloc_tx(&ch->dma); 284 request_irq(irq, ltq_etop_dma_irq, 0, "etop_tx", priv); 285 } else if (IS_RX(i)) { 286 ltq_dma_alloc_rx(&ch->dma); 287 for (ch->dma.desc = 0; ch->dma.desc < LTQ_DESC_NUM; 288 ch->dma.desc++) 289 if (ltq_etop_alloc_skb(ch)) 290 return -ENOMEM; 291 ch->dma.desc = 0; 292 request_irq(irq, ltq_etop_dma_irq, 0, "etop_rx", priv); 293 } 294 ch->dma.irq = irq; 295 } 296 return 0; 297 } 298 299 static void 300 ltq_etop_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) 301 { 302 strlcpy(info->driver, "Lantiq ETOP", sizeof(info->driver)); 303 strlcpy(info->bus_info, "internal", sizeof(info->bus_info)); 304 strlcpy(info->version, DRV_VERSION, sizeof(info->version)); 305 } 306 307 static int 308 ltq_etop_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 309 { 310 struct ltq_etop_priv *priv = netdev_priv(dev); 311 312 return phy_ethtool_gset(priv->phydev, cmd); 313 } 314 315 static int 316 ltq_etop_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) 317 { 318 struct ltq_etop_priv *priv = netdev_priv(dev); 319 320 return phy_ethtool_sset(priv->phydev, cmd); 321 } 322 323 static int 324 ltq_etop_nway_reset(struct net_device *dev) 325 { 326 struct ltq_etop_priv *priv = netdev_priv(dev); 327 328 return phy_start_aneg(priv->phydev); 329 } 330 331 static const struct ethtool_ops ltq_etop_ethtool_ops = { 332 .get_drvinfo = ltq_etop_get_drvinfo, 333 .get_settings = ltq_etop_get_settings, 334 .set_settings = ltq_etop_set_settings, 335 .nway_reset = ltq_etop_nway_reset, 336 }; 337 338 static int 339 ltq_etop_mdio_wr(struct mii_bus *bus, int phy_addr, int phy_reg, u16 phy_data) 340 { 341 u32 val = MDIO_REQUEST | 342 ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) | 343 ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET) | 344 phy_data; 345 346 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST) 347 ; 348 ltq_etop_w32(val, LTQ_ETOP_MDIO); 349 return 0; 350 } 351 352 static int 353 ltq_etop_mdio_rd(struct mii_bus *bus, int phy_addr, int phy_reg) 354 { 355 u32 val = MDIO_REQUEST | MDIO_READ | 356 ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) | 357 ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET); 358 359 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST) 360 ; 361 ltq_etop_w32(val, LTQ_ETOP_MDIO); 362 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST) 363 ; 364 val = ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_VAL_MASK; 365 return val; 366 } 367 368 static void 369 ltq_etop_mdio_link(struct net_device *dev) 370 { 371 /* nothing to do */ 372 } 373 374 static int 375 ltq_etop_mdio_probe(struct net_device *dev) 376 { 377 struct ltq_etop_priv *priv = netdev_priv(dev); 378 struct phy_device *phydev; 379 380 phydev = phy_find_first(priv->mii_bus); 381 382 if (!phydev) { 383 netdev_err(dev, "no PHY found\n"); 384 return -ENODEV; 385 } 386 387 phydev = phy_connect(dev, phydev_name(phydev), 388 <q_etop_mdio_link, priv->pldata->mii_mode); 389 390 if (IS_ERR(phydev)) { 391 netdev_err(dev, "Could not attach to PHY\n"); 392 return PTR_ERR(phydev); 393 } 394 395 phydev->supported &= (SUPPORTED_10baseT_Half 396 | SUPPORTED_10baseT_Full 397 | SUPPORTED_100baseT_Half 398 | SUPPORTED_100baseT_Full 399 | SUPPORTED_Autoneg 400 | SUPPORTED_MII 401 | SUPPORTED_TP); 402 403 phydev->advertising = phydev->supported; 404 priv->phydev = phydev; 405 phy_attached_info(phydev); 406 407 return 0; 408 } 409 410 static int 411 ltq_etop_mdio_init(struct net_device *dev) 412 { 413 struct ltq_etop_priv *priv = netdev_priv(dev); 414 int i; 415 int err; 416 417 priv->mii_bus = mdiobus_alloc(); 418 if (!priv->mii_bus) { 419 netdev_err(dev, "failed to allocate mii bus\n"); 420 err = -ENOMEM; 421 goto err_out; 422 } 423 424 priv->mii_bus->priv = dev; 425 priv->mii_bus->read = ltq_etop_mdio_rd; 426 priv->mii_bus->write = ltq_etop_mdio_wr; 427 priv->mii_bus->name = "ltq_mii"; 428 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x", 429 priv->pdev->name, priv->pdev->id); 430 if (mdiobus_register(priv->mii_bus)) { 431 err = -ENXIO; 432 goto err_out_free_mdiobus; 433 } 434 435 if (ltq_etop_mdio_probe(dev)) { 436 err = -ENXIO; 437 goto err_out_unregister_bus; 438 } 439 return 0; 440 441 err_out_unregister_bus: 442 mdiobus_unregister(priv->mii_bus); 443 err_out_free_mdiobus: 444 mdiobus_free(priv->mii_bus); 445 err_out: 446 return err; 447 } 448 449 static void 450 ltq_etop_mdio_cleanup(struct net_device *dev) 451 { 452 struct ltq_etop_priv *priv = netdev_priv(dev); 453 454 phy_disconnect(priv->phydev); 455 mdiobus_unregister(priv->mii_bus); 456 mdiobus_free(priv->mii_bus); 457 } 458 459 static int 460 ltq_etop_open(struct net_device *dev) 461 { 462 struct ltq_etop_priv *priv = netdev_priv(dev); 463 int i; 464 465 for (i = 0; i < MAX_DMA_CHAN; i++) { 466 struct ltq_etop_chan *ch = &priv->ch[i]; 467 468 if (!IS_TX(i) && (!IS_RX(i))) 469 continue; 470 ltq_dma_open(&ch->dma); 471 napi_enable(&ch->napi); 472 } 473 phy_start(priv->phydev); 474 netif_tx_start_all_queues(dev); 475 return 0; 476 } 477 478 static int 479 ltq_etop_stop(struct net_device *dev) 480 { 481 struct ltq_etop_priv *priv = netdev_priv(dev); 482 int i; 483 484 netif_tx_stop_all_queues(dev); 485 phy_stop(priv->phydev); 486 for (i = 0; i < MAX_DMA_CHAN; i++) { 487 struct ltq_etop_chan *ch = &priv->ch[i]; 488 489 if (!IS_RX(i) && !IS_TX(i)) 490 continue; 491 napi_disable(&ch->napi); 492 ltq_dma_close(&ch->dma); 493 } 494 return 0; 495 } 496 497 static int 498 ltq_etop_tx(struct sk_buff *skb, struct net_device *dev) 499 { 500 int queue = skb_get_queue_mapping(skb); 501 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue); 502 struct ltq_etop_priv *priv = netdev_priv(dev); 503 struct ltq_etop_chan *ch = &priv->ch[(queue << 1) | 1]; 504 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc]; 505 int len; 506 unsigned long flags; 507 u32 byte_offset; 508 509 len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len; 510 511 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) { 512 dev_kfree_skb_any(skb); 513 netdev_err(dev, "tx ring full\n"); 514 netif_tx_stop_queue(txq); 515 return NETDEV_TX_BUSY; 516 } 517 518 /* dma needs to start on a 16 byte aligned address */ 519 byte_offset = CPHYSADDR(skb->data) % 16; 520 ch->skb[ch->dma.desc] = skb; 521 522 dev->trans_start = jiffies; 523 524 spin_lock_irqsave(&priv->lock, flags); 525 desc->addr = ((unsigned int) dma_map_single(NULL, skb->data, len, 526 DMA_TO_DEVICE)) - byte_offset; 527 wmb(); 528 desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP | 529 LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK); 530 ch->dma.desc++; 531 ch->dma.desc %= LTQ_DESC_NUM; 532 spin_unlock_irqrestore(&priv->lock, flags); 533 534 if (ch->dma.desc_base[ch->dma.desc].ctl & LTQ_DMA_OWN) 535 netif_tx_stop_queue(txq); 536 537 return NETDEV_TX_OK; 538 } 539 540 static int 541 ltq_etop_change_mtu(struct net_device *dev, int new_mtu) 542 { 543 int ret = eth_change_mtu(dev, new_mtu); 544 545 if (!ret) { 546 struct ltq_etop_priv *priv = netdev_priv(dev); 547 unsigned long flags; 548 549 spin_lock_irqsave(&priv->lock, flags); 550 ltq_etop_w32((ETOP_PLEN_UNDER << 16) | new_mtu, 551 LTQ_ETOP_IGPLEN); 552 spin_unlock_irqrestore(&priv->lock, flags); 553 } 554 return ret; 555 } 556 557 static int 558 ltq_etop_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 559 { 560 struct ltq_etop_priv *priv = netdev_priv(dev); 561 562 /* TODO: mii-toll reports "No MII transceiver present!." ?!*/ 563 return phy_mii_ioctl(priv->phydev, rq, cmd); 564 } 565 566 static int 567 ltq_etop_set_mac_address(struct net_device *dev, void *p) 568 { 569 int ret = eth_mac_addr(dev, p); 570 571 if (!ret) { 572 struct ltq_etop_priv *priv = netdev_priv(dev); 573 unsigned long flags; 574 575 /* store the mac for the unicast filter */ 576 spin_lock_irqsave(&priv->lock, flags); 577 ltq_etop_w32(*((u32 *)dev->dev_addr), LTQ_ETOP_MAC_DA0); 578 ltq_etop_w32(*((u16 *)&dev->dev_addr[4]) << 16, 579 LTQ_ETOP_MAC_DA1); 580 spin_unlock_irqrestore(&priv->lock, flags); 581 } 582 return ret; 583 } 584 585 static void 586 ltq_etop_set_multicast_list(struct net_device *dev) 587 { 588 struct ltq_etop_priv *priv = netdev_priv(dev); 589 unsigned long flags; 590 591 /* ensure that the unicast filter is not enabled in promiscious mode */ 592 spin_lock_irqsave(&priv->lock, flags); 593 if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI)) 594 ltq_etop_w32_mask(ETOP_FTCU, 0, LTQ_ETOP_ENETS0); 595 else 596 ltq_etop_w32_mask(0, ETOP_FTCU, LTQ_ETOP_ENETS0); 597 spin_unlock_irqrestore(&priv->lock, flags); 598 } 599 600 static u16 601 ltq_etop_select_queue(struct net_device *dev, struct sk_buff *skb, 602 void *accel_priv, select_queue_fallback_t fallback) 603 { 604 /* we are currently only using the first queue */ 605 return 0; 606 } 607 608 static int 609 ltq_etop_init(struct net_device *dev) 610 { 611 struct ltq_etop_priv *priv = netdev_priv(dev); 612 struct sockaddr mac; 613 int err; 614 bool random_mac = false; 615 616 dev->watchdog_timeo = 10 * HZ; 617 err = ltq_etop_hw_init(dev); 618 if (err) 619 goto err_hw; 620 ltq_etop_change_mtu(dev, 1500); 621 622 memcpy(&mac, &priv->pldata->mac, sizeof(struct sockaddr)); 623 if (!is_valid_ether_addr(mac.sa_data)) { 624 pr_warn("etop: invalid MAC, using random\n"); 625 eth_random_addr(mac.sa_data); 626 random_mac = true; 627 } 628 629 err = ltq_etop_set_mac_address(dev, &mac); 630 if (err) 631 goto err_netdev; 632 633 /* Set addr_assign_type here, ltq_etop_set_mac_address would reset it. */ 634 if (random_mac) 635 dev->addr_assign_type = NET_ADDR_RANDOM; 636 637 ltq_etop_set_multicast_list(dev); 638 err = ltq_etop_mdio_init(dev); 639 if (err) 640 goto err_netdev; 641 return 0; 642 643 err_netdev: 644 unregister_netdev(dev); 645 free_netdev(dev); 646 err_hw: 647 ltq_etop_hw_exit(dev); 648 return err; 649 } 650 651 static void 652 ltq_etop_tx_timeout(struct net_device *dev) 653 { 654 int err; 655 656 ltq_etop_hw_exit(dev); 657 err = ltq_etop_hw_init(dev); 658 if (err) 659 goto err_hw; 660 dev->trans_start = jiffies; 661 netif_wake_queue(dev); 662 return; 663 664 err_hw: 665 ltq_etop_hw_exit(dev); 666 netdev_err(dev, "failed to restart etop after TX timeout\n"); 667 } 668 669 static const struct net_device_ops ltq_eth_netdev_ops = { 670 .ndo_open = ltq_etop_open, 671 .ndo_stop = ltq_etop_stop, 672 .ndo_start_xmit = ltq_etop_tx, 673 .ndo_change_mtu = ltq_etop_change_mtu, 674 .ndo_do_ioctl = ltq_etop_ioctl, 675 .ndo_set_mac_address = ltq_etop_set_mac_address, 676 .ndo_validate_addr = eth_validate_addr, 677 .ndo_set_rx_mode = ltq_etop_set_multicast_list, 678 .ndo_select_queue = ltq_etop_select_queue, 679 .ndo_init = ltq_etop_init, 680 .ndo_tx_timeout = ltq_etop_tx_timeout, 681 }; 682 683 static int __init 684 ltq_etop_probe(struct platform_device *pdev) 685 { 686 struct net_device *dev; 687 struct ltq_etop_priv *priv; 688 struct resource *res; 689 int err; 690 int i; 691 692 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 693 if (!res) { 694 dev_err(&pdev->dev, "failed to get etop resource\n"); 695 err = -ENOENT; 696 goto err_out; 697 } 698 699 res = devm_request_mem_region(&pdev->dev, res->start, 700 resource_size(res), dev_name(&pdev->dev)); 701 if (!res) { 702 dev_err(&pdev->dev, "failed to request etop resource\n"); 703 err = -EBUSY; 704 goto err_out; 705 } 706 707 ltq_etop_membase = devm_ioremap_nocache(&pdev->dev, 708 res->start, resource_size(res)); 709 if (!ltq_etop_membase) { 710 dev_err(&pdev->dev, "failed to remap etop engine %d\n", 711 pdev->id); 712 err = -ENOMEM; 713 goto err_out; 714 } 715 716 dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4); 717 if (!dev) { 718 err = -ENOMEM; 719 goto err_out; 720 } 721 strcpy(dev->name, "eth%d"); 722 dev->netdev_ops = <q_eth_netdev_ops; 723 dev->ethtool_ops = <q_etop_ethtool_ops; 724 priv = netdev_priv(dev); 725 priv->res = res; 726 priv->pdev = pdev; 727 priv->pldata = dev_get_platdata(&pdev->dev); 728 priv->netdev = dev; 729 spin_lock_init(&priv->lock); 730 731 for (i = 0; i < MAX_DMA_CHAN; i++) { 732 if (IS_TX(i)) 733 netif_napi_add(dev, &priv->ch[i].napi, 734 ltq_etop_poll_tx, 8); 735 else if (IS_RX(i)) 736 netif_napi_add(dev, &priv->ch[i].napi, 737 ltq_etop_poll_rx, 32); 738 priv->ch[i].netdev = dev; 739 } 740 741 err = register_netdev(dev); 742 if (err) 743 goto err_free; 744 745 platform_set_drvdata(pdev, dev); 746 return 0; 747 748 err_free: 749 free_netdev(dev); 750 err_out: 751 return err; 752 } 753 754 static int 755 ltq_etop_remove(struct platform_device *pdev) 756 { 757 struct net_device *dev = platform_get_drvdata(pdev); 758 759 if (dev) { 760 netif_tx_stop_all_queues(dev); 761 ltq_etop_hw_exit(dev); 762 ltq_etop_mdio_cleanup(dev); 763 unregister_netdev(dev); 764 } 765 return 0; 766 } 767 768 static struct platform_driver ltq_mii_driver = { 769 .remove = ltq_etop_remove, 770 .driver = { 771 .name = "ltq_etop", 772 }, 773 }; 774 775 int __init 776 init_ltq_etop(void) 777 { 778 int ret = platform_driver_probe(<q_mii_driver, ltq_etop_probe); 779 780 if (ret) 781 pr_err("ltq_etop: Error registering platform driver!"); 782 return ret; 783 } 784 785 static void __exit 786 exit_ltq_etop(void) 787 { 788 platform_driver_unregister(<q_mii_driver); 789 } 790 791 module_init(init_ltq_etop); 792 module_exit(exit_ltq_etop); 793 794 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>"); 795 MODULE_DESCRIPTION("Lantiq SoC ETOP"); 796 MODULE_LICENSE("GPL"); 797