1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * Copyright (C) 2011 John Crispin <blogic@openwrt.org> 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/slab.h> 9 #include <linux/errno.h> 10 #include <linux/types.h> 11 #include <linux/interrupt.h> 12 #include <linux/uaccess.h> 13 #include <linux/in.h> 14 #include <linux/netdevice.h> 15 #include <linux/etherdevice.h> 16 #include <linux/phy.h> 17 #include <linux/ip.h> 18 #include <linux/tcp.h> 19 #include <linux/skbuff.h> 20 #include <linux/mm.h> 21 #include <linux/platform_device.h> 22 #include <linux/ethtool.h> 23 #include <linux/init.h> 24 #include <linux/delay.h> 25 #include <linux/io.h> 26 #include <linux/dma-mapping.h> 27 #include <linux/module.h> 28 #include <linux/property.h> 29 30 #include <asm/checksum.h> 31 32 #include <lantiq_soc.h> 33 #include <xway_dma.h> 34 #include <lantiq_platform.h> 35 36 #define LTQ_ETOP_MDIO 0x11804 37 #define MDIO_REQUEST 0x80000000 38 #define MDIO_READ 0x40000000 39 #define MDIO_ADDR_MASK 0x1f 40 #define MDIO_ADDR_OFFSET 0x15 41 #define MDIO_REG_MASK 0x1f 42 #define MDIO_REG_OFFSET 0x10 43 #define MDIO_VAL_MASK 0xffff 44 45 #define PPE32_CGEN 0x800 46 #define LQ_PPE32_ENET_MAC_CFG 0x1840 47 48 #define LTQ_ETOP_ENETS0 0x11850 49 #define LTQ_ETOP_MAC_DA0 0x1186C 50 #define LTQ_ETOP_MAC_DA1 0x11870 51 #define LTQ_ETOP_CFG 0x16020 52 #define LTQ_ETOP_IGPLEN 0x16080 53 54 #define MAX_DMA_CHAN 0x8 55 #define MAX_DMA_CRC_LEN 0x4 56 #define MAX_DMA_DATA_LEN 0x600 57 58 #define ETOP_FTCU BIT(28) 59 #define ETOP_MII_MASK 0xf 60 #define ETOP_MII_NORMAL 0xd 61 #define ETOP_MII_REVERSE 0xe 62 #define ETOP_PLEN_UNDER 0x40 63 #define ETOP_CGEN 0x800 64 65 /* use 2 static channels for TX/RX */ 66 #define LTQ_ETOP_TX_CHANNEL 1 67 #define LTQ_ETOP_RX_CHANNEL 6 68 #define IS_TX(x) ((x) == LTQ_ETOP_TX_CHANNEL) 69 #define IS_RX(x) ((x) == LTQ_ETOP_RX_CHANNEL) 70 71 #define ltq_etop_r32(x) ltq_r32(ltq_etop_membase + (x)) 72 #define ltq_etop_w32(x, y) ltq_w32(x, ltq_etop_membase + (y)) 73 #define ltq_etop_w32_mask(x, y, z) \ 74 ltq_w32_mask(x, y, ltq_etop_membase + (z)) 75 76 #define DRV_VERSION "1.0" 77 78 static void __iomem *ltq_etop_membase; 79 80 struct ltq_etop_chan { 81 int idx; 82 int tx_free; 83 struct net_device *netdev; 84 struct napi_struct napi; 85 struct ltq_dma_channel dma; 86 struct sk_buff *skb[LTQ_DESC_NUM]; 87 }; 88 89 struct ltq_etop_priv { 90 struct net_device *netdev; 91 struct platform_device *pdev; 92 struct ltq_eth_data *pldata; 93 struct resource *res; 94 95 struct mii_bus *mii_bus; 96 97 struct ltq_etop_chan ch[MAX_DMA_CHAN]; 98 int tx_free[MAX_DMA_CHAN >> 1]; 99 100 int tx_burst_len; 101 int rx_burst_len; 102 103 spinlock_t lock; 104 }; 105 106 static int ltq_etop_alloc_skb(struct ltq_etop_chan * ch)107 ltq_etop_alloc_skb(struct ltq_etop_chan *ch) 108 { 109 struct ltq_etop_priv *priv = netdev_priv(ch->netdev); 110 111 ch->skb[ch->dma.desc] = netdev_alloc_skb(ch->netdev, MAX_DMA_DATA_LEN); 112 if (!ch->skb[ch->dma.desc]) 113 return -ENOMEM; 114 ch->dma.desc_base[ch->dma.desc].addr = 115 dma_map_single(&priv->pdev->dev, ch->skb[ch->dma.desc]->data, 116 MAX_DMA_DATA_LEN, DMA_FROM_DEVICE); 117 ch->dma.desc_base[ch->dma.desc].addr = 118 CPHYSADDR(ch->skb[ch->dma.desc]->data); 119 ch->dma.desc_base[ch->dma.desc].ctl = 120 LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) | 121 MAX_DMA_DATA_LEN; 122 skb_reserve(ch->skb[ch->dma.desc], NET_IP_ALIGN); 123 return 0; 124 } 125 126 static void ltq_etop_hw_receive(struct ltq_etop_chan * ch)127 ltq_etop_hw_receive(struct ltq_etop_chan *ch) 128 { 129 struct ltq_etop_priv *priv = netdev_priv(ch->netdev); 130 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc]; 131 struct sk_buff *skb = ch->skb[ch->dma.desc]; 132 int len = (desc->ctl & LTQ_DMA_SIZE_MASK) - MAX_DMA_CRC_LEN; 133 unsigned long flags; 134 135 spin_lock_irqsave(&priv->lock, flags); 136 if (ltq_etop_alloc_skb(ch)) { 137 netdev_err(ch->netdev, 138 "failed to allocate new rx buffer, stopping DMA\n"); 139 ltq_dma_close(&ch->dma); 140 } 141 ch->dma.desc++; 142 ch->dma.desc %= LTQ_DESC_NUM; 143 spin_unlock_irqrestore(&priv->lock, flags); 144 145 skb_put(skb, len); 146 skb->protocol = eth_type_trans(skb, ch->netdev); 147 netif_receive_skb(skb); 148 } 149 150 static int ltq_etop_poll_rx(struct napi_struct * napi,int budget)151 ltq_etop_poll_rx(struct napi_struct *napi, int budget) 152 { 153 struct ltq_etop_chan *ch = container_of(napi, 154 struct ltq_etop_chan, napi); 155 int work_done = 0; 156 157 while (work_done < budget) { 158 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc]; 159 160 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) != LTQ_DMA_C) 161 break; 162 ltq_etop_hw_receive(ch); 163 work_done++; 164 } 165 if (work_done < budget) { 166 napi_complete_done(&ch->napi, work_done); 167 ltq_dma_ack_irq(&ch->dma); 168 } 169 return work_done; 170 } 171 172 static int ltq_etop_poll_tx(struct napi_struct * napi,int budget)173 ltq_etop_poll_tx(struct napi_struct *napi, int budget) 174 { 175 struct ltq_etop_chan *ch = 176 container_of(napi, struct ltq_etop_chan, napi); 177 struct ltq_etop_priv *priv = netdev_priv(ch->netdev); 178 struct netdev_queue *txq = 179 netdev_get_tx_queue(ch->netdev, ch->idx >> 1); 180 unsigned long flags; 181 182 spin_lock_irqsave(&priv->lock, flags); 183 while ((ch->dma.desc_base[ch->tx_free].ctl & 184 (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) { 185 dev_kfree_skb_any(ch->skb[ch->tx_free]); 186 ch->skb[ch->tx_free] = NULL; 187 memset(&ch->dma.desc_base[ch->tx_free], 0, 188 sizeof(struct ltq_dma_desc)); 189 ch->tx_free++; 190 ch->tx_free %= LTQ_DESC_NUM; 191 } 192 spin_unlock_irqrestore(&priv->lock, flags); 193 194 if (netif_tx_queue_stopped(txq)) 195 netif_tx_start_queue(txq); 196 napi_complete(&ch->napi); 197 ltq_dma_ack_irq(&ch->dma); 198 return 1; 199 } 200 201 static irqreturn_t ltq_etop_dma_irq(int irq,void * _priv)202 ltq_etop_dma_irq(int irq, void *_priv) 203 { 204 struct ltq_etop_priv *priv = _priv; 205 int ch = irq - LTQ_DMA_CH0_INT; 206 207 napi_schedule(&priv->ch[ch].napi); 208 return IRQ_HANDLED; 209 } 210 211 static void ltq_etop_free_channel(struct net_device * dev,struct ltq_etop_chan * ch)212 ltq_etop_free_channel(struct net_device *dev, struct ltq_etop_chan *ch) 213 { 214 struct ltq_etop_priv *priv = netdev_priv(dev); 215 216 ltq_dma_free(&ch->dma); 217 if (ch->dma.irq) 218 free_irq(ch->dma.irq, priv); 219 if (IS_RX(ch->idx)) { 220 struct ltq_dma_channel *dma = &ch->dma; 221 222 for (dma->desc = 0; dma->desc < LTQ_DESC_NUM; dma->desc++) 223 dev_kfree_skb_any(ch->skb[ch->dma.desc]); 224 } 225 } 226 227 static void ltq_etop_hw_exit(struct net_device * dev)228 ltq_etop_hw_exit(struct net_device *dev) 229 { 230 struct ltq_etop_priv *priv = netdev_priv(dev); 231 int i; 232 233 ltq_pmu_disable(PMU_PPE); 234 for (i = 0; i < MAX_DMA_CHAN; i++) 235 if (IS_TX(i) || IS_RX(i)) 236 ltq_etop_free_channel(dev, &priv->ch[i]); 237 } 238 239 static int ltq_etop_hw_init(struct net_device * dev)240 ltq_etop_hw_init(struct net_device *dev) 241 { 242 struct ltq_etop_priv *priv = netdev_priv(dev); 243 int i; 244 int err; 245 246 ltq_pmu_enable(PMU_PPE); 247 248 switch (priv->pldata->mii_mode) { 249 case PHY_INTERFACE_MODE_RMII: 250 ltq_etop_w32_mask(ETOP_MII_MASK, ETOP_MII_REVERSE, 251 LTQ_ETOP_CFG); 252 break; 253 254 case PHY_INTERFACE_MODE_MII: 255 ltq_etop_w32_mask(ETOP_MII_MASK, ETOP_MII_NORMAL, 256 LTQ_ETOP_CFG); 257 break; 258 259 default: 260 netdev_err(dev, "unknown mii mode %d\n", 261 priv->pldata->mii_mode); 262 return -ENOTSUPP; 263 } 264 265 /* enable crc generation */ 266 ltq_etop_w32(PPE32_CGEN, LQ_PPE32_ENET_MAC_CFG); 267 268 ltq_dma_init_port(DMA_PORT_ETOP, priv->tx_burst_len, priv->rx_burst_len); 269 270 for (i = 0; i < MAX_DMA_CHAN; i++) { 271 int irq = LTQ_DMA_CH0_INT + i; 272 struct ltq_etop_chan *ch = &priv->ch[i]; 273 274 ch->dma.nr = i; 275 ch->idx = ch->dma.nr; 276 ch->dma.dev = &priv->pdev->dev; 277 278 if (IS_TX(i)) { 279 ltq_dma_alloc_tx(&ch->dma); 280 err = request_irq(irq, ltq_etop_dma_irq, 0, "etop_tx", priv); 281 if (err) { 282 netdev_err(dev, 283 "Unable to get Tx DMA IRQ %d\n", 284 irq); 285 return err; 286 } 287 } else if (IS_RX(i)) { 288 ltq_dma_alloc_rx(&ch->dma); 289 for (ch->dma.desc = 0; ch->dma.desc < LTQ_DESC_NUM; 290 ch->dma.desc++) 291 if (ltq_etop_alloc_skb(ch)) 292 return -ENOMEM; 293 ch->dma.desc = 0; 294 err = request_irq(irq, ltq_etop_dma_irq, 0, "etop_rx", priv); 295 if (err) { 296 netdev_err(dev, 297 "Unable to get Rx DMA IRQ %d\n", 298 irq); 299 return err; 300 } 301 } 302 ch->dma.irq = irq; 303 } 304 return 0; 305 } 306 307 static void ltq_etop_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)308 ltq_etop_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) 309 { 310 strscpy(info->driver, "Lantiq ETOP", sizeof(info->driver)); 311 strscpy(info->bus_info, "internal", sizeof(info->bus_info)); 312 strscpy(info->version, DRV_VERSION, sizeof(info->version)); 313 } 314 315 static const struct ethtool_ops ltq_etop_ethtool_ops = { 316 .get_drvinfo = ltq_etop_get_drvinfo, 317 .nway_reset = phy_ethtool_nway_reset, 318 .get_link_ksettings = phy_ethtool_get_link_ksettings, 319 .set_link_ksettings = phy_ethtool_set_link_ksettings, 320 }; 321 322 static int ltq_etop_mdio_wr(struct mii_bus * bus,int phy_addr,int phy_reg,u16 phy_data)323 ltq_etop_mdio_wr(struct mii_bus *bus, int phy_addr, int phy_reg, u16 phy_data) 324 { 325 u32 val = MDIO_REQUEST | 326 ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) | 327 ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET) | 328 phy_data; 329 330 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST) 331 ; 332 ltq_etop_w32(val, LTQ_ETOP_MDIO); 333 return 0; 334 } 335 336 static int ltq_etop_mdio_rd(struct mii_bus * bus,int phy_addr,int phy_reg)337 ltq_etop_mdio_rd(struct mii_bus *bus, int phy_addr, int phy_reg) 338 { 339 u32 val = MDIO_REQUEST | MDIO_READ | 340 ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) | 341 ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET); 342 343 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST) 344 ; 345 ltq_etop_w32(val, LTQ_ETOP_MDIO); 346 while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST) 347 ; 348 val = ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_VAL_MASK; 349 return val; 350 } 351 352 static void ltq_etop_mdio_link(struct net_device * dev)353 ltq_etop_mdio_link(struct net_device *dev) 354 { 355 /* nothing to do */ 356 } 357 358 static int ltq_etop_mdio_probe(struct net_device * dev)359 ltq_etop_mdio_probe(struct net_device *dev) 360 { 361 struct ltq_etop_priv *priv = netdev_priv(dev); 362 struct phy_device *phydev; 363 364 phydev = phy_find_first(priv->mii_bus); 365 366 if (!phydev) { 367 netdev_err(dev, "no PHY found\n"); 368 return -ENODEV; 369 } 370 371 phydev = phy_connect(dev, phydev_name(phydev), 372 <q_etop_mdio_link, priv->pldata->mii_mode); 373 374 if (IS_ERR(phydev)) { 375 netdev_err(dev, "Could not attach to PHY\n"); 376 return PTR_ERR(phydev); 377 } 378 379 phy_set_max_speed(phydev, SPEED_100); 380 381 phy_attached_info(phydev); 382 383 return 0; 384 } 385 386 static int ltq_etop_mdio_init(struct net_device * dev)387 ltq_etop_mdio_init(struct net_device *dev) 388 { 389 struct ltq_etop_priv *priv = netdev_priv(dev); 390 int err; 391 392 priv->mii_bus = mdiobus_alloc(); 393 if (!priv->mii_bus) { 394 netdev_err(dev, "failed to allocate mii bus\n"); 395 err = -ENOMEM; 396 goto err_out; 397 } 398 399 priv->mii_bus->priv = dev; 400 priv->mii_bus->read = ltq_etop_mdio_rd; 401 priv->mii_bus->write = ltq_etop_mdio_wr; 402 priv->mii_bus->name = "ltq_mii"; 403 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x", 404 priv->pdev->name, priv->pdev->id); 405 if (mdiobus_register(priv->mii_bus)) { 406 err = -ENXIO; 407 goto err_out_free_mdiobus; 408 } 409 410 if (ltq_etop_mdio_probe(dev)) { 411 err = -ENXIO; 412 goto err_out_unregister_bus; 413 } 414 return 0; 415 416 err_out_unregister_bus: 417 mdiobus_unregister(priv->mii_bus); 418 err_out_free_mdiobus: 419 mdiobus_free(priv->mii_bus); 420 err_out: 421 return err; 422 } 423 424 static void ltq_etop_mdio_cleanup(struct net_device * dev)425 ltq_etop_mdio_cleanup(struct net_device *dev) 426 { 427 struct ltq_etop_priv *priv = netdev_priv(dev); 428 429 phy_disconnect(dev->phydev); 430 mdiobus_unregister(priv->mii_bus); 431 mdiobus_free(priv->mii_bus); 432 } 433 434 static int ltq_etop_open(struct net_device * dev)435 ltq_etop_open(struct net_device *dev) 436 { 437 struct ltq_etop_priv *priv = netdev_priv(dev); 438 int i; 439 440 for (i = 0; i < MAX_DMA_CHAN; i++) { 441 struct ltq_etop_chan *ch = &priv->ch[i]; 442 443 if (!IS_TX(i) && (!IS_RX(i))) 444 continue; 445 ltq_dma_open(&ch->dma); 446 ltq_dma_enable_irq(&ch->dma); 447 napi_enable(&ch->napi); 448 } 449 phy_start(dev->phydev); 450 netif_tx_start_all_queues(dev); 451 return 0; 452 } 453 454 static int ltq_etop_stop(struct net_device * dev)455 ltq_etop_stop(struct net_device *dev) 456 { 457 struct ltq_etop_priv *priv = netdev_priv(dev); 458 int i; 459 460 netif_tx_stop_all_queues(dev); 461 phy_stop(dev->phydev); 462 for (i = 0; i < MAX_DMA_CHAN; i++) { 463 struct ltq_etop_chan *ch = &priv->ch[i]; 464 465 if (!IS_RX(i) && !IS_TX(i)) 466 continue; 467 napi_disable(&ch->napi); 468 ltq_dma_close(&ch->dma); 469 } 470 return 0; 471 } 472 473 static netdev_tx_t ltq_etop_tx(struct sk_buff * skb,struct net_device * dev)474 ltq_etop_tx(struct sk_buff *skb, struct net_device *dev) 475 { 476 int queue = skb_get_queue_mapping(skb); 477 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue); 478 struct ltq_etop_priv *priv = netdev_priv(dev); 479 struct ltq_etop_chan *ch = &priv->ch[(queue << 1) | 1]; 480 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc]; 481 int len; 482 unsigned long flags; 483 u32 byte_offset; 484 485 if (skb_put_padto(skb, ETH_ZLEN)) 486 return NETDEV_TX_OK; 487 len = skb->len; 488 489 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) { 490 netdev_err(dev, "tx ring full\n"); 491 netif_tx_stop_queue(txq); 492 return NETDEV_TX_BUSY; 493 } 494 495 /* dma needs to start on a burst length value aligned address */ 496 byte_offset = CPHYSADDR(skb->data) % (priv->tx_burst_len * 4); 497 ch->skb[ch->dma.desc] = skb; 498 499 netif_trans_update(dev); 500 501 spin_lock_irqsave(&priv->lock, flags); 502 desc->addr = ((unsigned int)dma_map_single(&priv->pdev->dev, skb->data, len, 503 DMA_TO_DEVICE)) - byte_offset; 504 /* Make sure the address is written before we give it to HW */ 505 wmb(); 506 desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP | 507 LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK); 508 ch->dma.desc++; 509 ch->dma.desc %= LTQ_DESC_NUM; 510 spin_unlock_irqrestore(&priv->lock, flags); 511 512 if (ch->dma.desc_base[ch->dma.desc].ctl & LTQ_DMA_OWN) 513 netif_tx_stop_queue(txq); 514 515 return NETDEV_TX_OK; 516 } 517 518 static int ltq_etop_change_mtu(struct net_device * dev,int new_mtu)519 ltq_etop_change_mtu(struct net_device *dev, int new_mtu) 520 { 521 struct ltq_etop_priv *priv = netdev_priv(dev); 522 unsigned long flags; 523 524 dev->mtu = new_mtu; 525 526 spin_lock_irqsave(&priv->lock, flags); 527 ltq_etop_w32((ETOP_PLEN_UNDER << 16) | new_mtu, LTQ_ETOP_IGPLEN); 528 spin_unlock_irqrestore(&priv->lock, flags); 529 530 return 0; 531 } 532 533 static int ltq_etop_set_mac_address(struct net_device * dev,void * p)534 ltq_etop_set_mac_address(struct net_device *dev, void *p) 535 { 536 int ret = eth_mac_addr(dev, p); 537 538 if (!ret) { 539 struct ltq_etop_priv *priv = netdev_priv(dev); 540 unsigned long flags; 541 542 /* store the mac for the unicast filter */ 543 spin_lock_irqsave(&priv->lock, flags); 544 ltq_etop_w32(*((u32 *)dev->dev_addr), LTQ_ETOP_MAC_DA0); 545 ltq_etop_w32(*((u16 *)&dev->dev_addr[4]) << 16, 546 LTQ_ETOP_MAC_DA1); 547 spin_unlock_irqrestore(&priv->lock, flags); 548 } 549 return ret; 550 } 551 552 static void ltq_etop_set_multicast_list(struct net_device * dev)553 ltq_etop_set_multicast_list(struct net_device *dev) 554 { 555 struct ltq_etop_priv *priv = netdev_priv(dev); 556 unsigned long flags; 557 558 /* ensure that the unicast filter is not enabled in promiscious mode */ 559 spin_lock_irqsave(&priv->lock, flags); 560 if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI)) 561 ltq_etop_w32_mask(ETOP_FTCU, 0, LTQ_ETOP_ENETS0); 562 else 563 ltq_etop_w32_mask(0, ETOP_FTCU, LTQ_ETOP_ENETS0); 564 spin_unlock_irqrestore(&priv->lock, flags); 565 } 566 567 static int ltq_etop_init(struct net_device * dev)568 ltq_etop_init(struct net_device *dev) 569 { 570 struct ltq_etop_priv *priv = netdev_priv(dev); 571 struct sockaddr mac; 572 int err; 573 bool random_mac = false; 574 575 dev->watchdog_timeo = 10 * HZ; 576 err = ltq_etop_hw_init(dev); 577 if (err) 578 goto err_hw; 579 ltq_etop_change_mtu(dev, 1500); 580 581 memcpy(&mac, &priv->pldata->mac, sizeof(struct sockaddr)); 582 if (!is_valid_ether_addr(mac.sa_data)) { 583 pr_warn("etop: invalid MAC, using random\n"); 584 eth_random_addr(mac.sa_data); 585 random_mac = true; 586 } 587 588 err = ltq_etop_set_mac_address(dev, &mac); 589 if (err) 590 goto err_netdev; 591 592 /* Set addr_assign_type here, ltq_etop_set_mac_address would reset it. */ 593 if (random_mac) 594 dev->addr_assign_type = NET_ADDR_RANDOM; 595 596 ltq_etop_set_multicast_list(dev); 597 err = ltq_etop_mdio_init(dev); 598 if (err) 599 goto err_netdev; 600 return 0; 601 602 err_netdev: 603 unregister_netdev(dev); 604 free_netdev(dev); 605 err_hw: 606 ltq_etop_hw_exit(dev); 607 return err; 608 } 609 610 static void ltq_etop_tx_timeout(struct net_device * dev,unsigned int txqueue)611 ltq_etop_tx_timeout(struct net_device *dev, unsigned int txqueue) 612 { 613 int err; 614 615 ltq_etop_hw_exit(dev); 616 err = ltq_etop_hw_init(dev); 617 if (err) 618 goto err_hw; 619 netif_trans_update(dev); 620 netif_wake_queue(dev); 621 return; 622 623 err_hw: 624 ltq_etop_hw_exit(dev); 625 netdev_err(dev, "failed to restart etop after TX timeout\n"); 626 } 627 628 static const struct net_device_ops ltq_eth_netdev_ops = { 629 .ndo_open = ltq_etop_open, 630 .ndo_stop = ltq_etop_stop, 631 .ndo_start_xmit = ltq_etop_tx, 632 .ndo_change_mtu = ltq_etop_change_mtu, 633 .ndo_eth_ioctl = phy_do_ioctl, 634 .ndo_set_mac_address = ltq_etop_set_mac_address, 635 .ndo_validate_addr = eth_validate_addr, 636 .ndo_set_rx_mode = ltq_etop_set_multicast_list, 637 .ndo_select_queue = dev_pick_tx_zero, 638 .ndo_init = ltq_etop_init, 639 .ndo_tx_timeout = ltq_etop_tx_timeout, 640 }; 641 642 static int __init ltq_etop_probe(struct platform_device * pdev)643 ltq_etop_probe(struct platform_device *pdev) 644 { 645 struct net_device *dev; 646 struct ltq_etop_priv *priv; 647 struct resource *res; 648 int err; 649 int i; 650 651 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 652 if (!res) { 653 dev_err(&pdev->dev, "failed to get etop resource\n"); 654 err = -ENOENT; 655 goto err_out; 656 } 657 658 res = devm_request_mem_region(&pdev->dev, res->start, 659 resource_size(res), dev_name(&pdev->dev)); 660 if (!res) { 661 dev_err(&pdev->dev, "failed to request etop resource\n"); 662 err = -EBUSY; 663 goto err_out; 664 } 665 666 ltq_etop_membase = devm_ioremap(&pdev->dev, res->start, 667 resource_size(res)); 668 if (!ltq_etop_membase) { 669 dev_err(&pdev->dev, "failed to remap etop engine %d\n", 670 pdev->id); 671 err = -ENOMEM; 672 goto err_out; 673 } 674 675 dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4); 676 if (!dev) { 677 err = -ENOMEM; 678 goto err_out; 679 } 680 strcpy(dev->name, "eth%d"); 681 dev->netdev_ops = <q_eth_netdev_ops; 682 dev->ethtool_ops = <q_etop_ethtool_ops; 683 priv = netdev_priv(dev); 684 priv->res = res; 685 priv->pdev = pdev; 686 priv->pldata = dev_get_platdata(&pdev->dev); 687 priv->netdev = dev; 688 spin_lock_init(&priv->lock); 689 SET_NETDEV_DEV(dev, &pdev->dev); 690 691 err = device_property_read_u32(&pdev->dev, "lantiq,tx-burst-length", &priv->tx_burst_len); 692 if (err < 0) { 693 dev_err(&pdev->dev, "unable to read tx-burst-length property\n"); 694 goto err_free; 695 } 696 697 err = device_property_read_u32(&pdev->dev, "lantiq,rx-burst-length", &priv->rx_burst_len); 698 if (err < 0) { 699 dev_err(&pdev->dev, "unable to read rx-burst-length property\n"); 700 goto err_free; 701 } 702 703 for (i = 0; i < MAX_DMA_CHAN; i++) { 704 if (IS_TX(i)) 705 netif_napi_add_weight(dev, &priv->ch[i].napi, 706 ltq_etop_poll_tx, 8); 707 else if (IS_RX(i)) 708 netif_napi_add_weight(dev, &priv->ch[i].napi, 709 ltq_etop_poll_rx, 32); 710 priv->ch[i].netdev = dev; 711 } 712 713 err = register_netdev(dev); 714 if (err) 715 goto err_free; 716 717 platform_set_drvdata(pdev, dev); 718 return 0; 719 720 err_free: 721 free_netdev(dev); 722 err_out: 723 return err; 724 } 725 726 static int ltq_etop_remove(struct platform_device * pdev)727 ltq_etop_remove(struct platform_device *pdev) 728 { 729 struct net_device *dev = platform_get_drvdata(pdev); 730 731 if (dev) { 732 netif_tx_stop_all_queues(dev); 733 ltq_etop_hw_exit(dev); 734 ltq_etop_mdio_cleanup(dev); 735 unregister_netdev(dev); 736 } 737 return 0; 738 } 739 740 static struct platform_driver ltq_mii_driver = { 741 .remove = ltq_etop_remove, 742 .driver = { 743 .name = "ltq_etop", 744 }, 745 }; 746 747 static int __init init_ltq_etop(void)748 init_ltq_etop(void) 749 { 750 int ret = platform_driver_probe(<q_mii_driver, ltq_etop_probe); 751 752 if (ret) 753 pr_err("ltq_etop: Error registering platform driver!"); 754 return ret; 755 } 756 757 static void __exit exit_ltq_etop(void)758 exit_ltq_etop(void) 759 { 760 platform_driver_unregister(<q_mii_driver); 761 } 762 763 module_init(init_ltq_etop); 764 module_exit(exit_ltq_etop); 765 766 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>"); 767 MODULE_DESCRIPTION("Lantiq SoC ETOP"); 768 MODULE_LICENSE("GPL"); 769