drivers/net/ethernet/lantiq_etop.c

   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                              &ltq_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 err;
 415
 416         priv->mii_bus = mdiobus_alloc();
 417         if (!priv->mii_bus) {
 418                 netdev_err(dev, "failed to allocate mii bus\n");
 419                 err = -ENOMEM;
 420                 goto err_out;
 421         }
 422
 423         priv->mii_bus->priv = dev;
 424         priv->mii_bus->read = ltq_etop_mdio_rd;
 425         priv->mii_bus->write = ltq_etop_mdio_wr;
 426         priv->mii_bus->name = "ltq_mii";
 427         snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
 428                 priv->pdev->name, priv->pdev->id);
 429         if (mdiobus_register(priv->mii_bus)) {
 430                 err = -ENXIO;
 431                 goto err_out_free_mdiobus;
 432         }
 433
 434         if (ltq_etop_mdio_probe(dev)) {
 435                 err = -ENXIO;
 436                 goto err_out_unregister_bus;
 437         }
 438         return 0;
 439
 440 err_out_unregister_bus:
 441         mdiobus_unregister(priv->mii_bus);
 442 err_out_free_mdiobus:
 443         mdiobus_free(priv->mii_bus);
 444 err_out:
 445         return err;
 446 }
 447
 448 static void
 449 ltq_etop_mdio_cleanup(struct net_device *dev)
 450 {
 451         struct ltq_etop_priv *priv = netdev_priv(dev);
 452
 453         phy_disconnect(priv->phydev);
 454         mdiobus_unregister(priv->mii_bus);
 455         mdiobus_free(priv->mii_bus);
 456 }
 457
 458 static int
 459 ltq_etop_open(struct net_device *dev)
 460 {
 461         struct ltq_etop_priv *priv = netdev_priv(dev);
 462         int i;
 463
 464         for (i = 0; i < MAX_DMA_CHAN; i++) {
 465                 struct ltq_etop_chan *ch = &priv->ch[i];
 466
 467                 if (!IS_TX(i) && (!IS_RX(i)))
 468                         continue;
 469                 ltq_dma_open(&ch->dma);
 470                 napi_enable(&ch->napi);
 471         }
 472         phy_start(priv->phydev);
 473         netif_tx_start_all_queues(dev);
 474         return 0;
 475 }
 476
 477 static int
 478 ltq_etop_stop(struct net_device *dev)
 479 {
 480         struct ltq_etop_priv *priv = netdev_priv(dev);
 481         int i;
 482
 483         netif_tx_stop_all_queues(dev);
 484         phy_stop(priv->phydev);
 485         for (i = 0; i < MAX_DMA_CHAN; i++) {
 486                 struct ltq_etop_chan *ch = &priv->ch[i];
 487
 488                 if (!IS_RX(i) && !IS_TX(i))
 489                         continue;
 490                 napi_disable(&ch->napi);
 491                 ltq_dma_close(&ch->dma);
 492         }
 493         return 0;
 494 }
 495
 496 static int
 497 ltq_etop_tx(struct sk_buff *skb, struct net_device *dev)
 498 {
 499         int queue = skb_get_queue_mapping(skb);
 500         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue);
 501         struct ltq_etop_priv *priv = netdev_priv(dev);
 502         struct ltq_etop_chan *ch = &priv->ch[(queue << 1) | 1];
 503         struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
 504         int len;
 505         unsigned long flags;
 506         u32 byte_offset;
 507
 508         len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
 509
 510         if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
 511                 dev_kfree_skb_any(skb);
 512                 netdev_err(dev, "tx ring full\n");
 513                 netif_tx_stop_queue(txq);
 514                 return NETDEV_TX_BUSY;
 515         }
 516
 517         /* dma needs to start on a 16 byte aligned address */
 518         byte_offset = CPHYSADDR(skb->data) % 16;
 519         ch->skb[ch->dma.desc] = skb;
 520
 521         netif_trans_update(dev);
 522
 523         spin_lock_irqsave(&priv->lock, flags);
 524         desc->addr = ((unsigned int) dma_map_single(NULL, skb->data, len,
 525                                                 DMA_TO_DEVICE)) - byte_offset;
 526         wmb();
 527         desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP |
 528                 LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK);
 529         ch->dma.desc++;
 530         ch->dma.desc %= LTQ_DESC_NUM;
 531         spin_unlock_irqrestore(&priv->lock, flags);
 532
 533         if (ch->dma.desc_base[ch->dma.desc].ctl & LTQ_DMA_OWN)
 534                 netif_tx_stop_queue(txq);
 535
 536         return NETDEV_TX_OK;
 537 }
 538
 539 static int
 540 ltq_etop_change_mtu(struct net_device *dev, int new_mtu)
 541 {
 542         int ret = eth_change_mtu(dev, new_mtu);
 543
 544         if (!ret) {
 545                 struct ltq_etop_priv *priv = netdev_priv(dev);
 546                 unsigned long flags;
 547
 548                 spin_lock_irqsave(&priv->lock, flags);
 549                 ltq_etop_w32((ETOP_PLEN_UNDER << 16) | new_mtu,
 550                         LTQ_ETOP_IGPLEN);
 551                 spin_unlock_irqrestore(&priv->lock, flags);
 552         }
 553         return ret;
 554 }
 555
 556 static int
 557 ltq_etop_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 558 {
 559         struct ltq_etop_priv *priv = netdev_priv(dev);
 560
 561         /* TODO: mii-toll reports "No MII transceiver present!." ?!*/
 562         return phy_mii_ioctl(priv->phydev, rq, cmd);
 563 }
 564
 565 static int
 566 ltq_etop_set_mac_address(struct net_device *dev, void *p)
 567 {
 568         int ret = eth_mac_addr(dev, p);
 569
 570         if (!ret) {
 571                 struct ltq_etop_priv *priv = netdev_priv(dev);
 572                 unsigned long flags;
 573
 574                 /* store the mac for the unicast filter */
 575                 spin_lock_irqsave(&priv->lock, flags);
 576                 ltq_etop_w32(*((u32 *)dev->dev_addr), LTQ_ETOP_MAC_DA0);
 577                 ltq_etop_w32(*((u16 *)&dev->dev_addr[4]) << 16,
 578                         LTQ_ETOP_MAC_DA1);
 579                 spin_unlock_irqrestore(&priv->lock, flags);
 580         }
 581         return ret;
 582 }
 583
 584 static void
 585 ltq_etop_set_multicast_list(struct net_device *dev)
 586 {
 587         struct ltq_etop_priv *priv = netdev_priv(dev);
 588         unsigned long flags;
 589
 590         /* ensure that the unicast filter is not enabled in promiscious mode */
 591         spin_lock_irqsave(&priv->lock, flags);
 592         if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI))
 593                 ltq_etop_w32_mask(ETOP_FTCU, 0, LTQ_ETOP_ENETS0);
 594         else
 595                 ltq_etop_w32_mask(0, ETOP_FTCU, LTQ_ETOP_ENETS0);
 596         spin_unlock_irqrestore(&priv->lock, flags);
 597 }
 598
 599 static u16
 600 ltq_etop_select_queue(struct net_device *dev, struct sk_buff *skb,
 601                       void *accel_priv, select_queue_fallback_t fallback)
 602 {
 603         /* we are currently only using the first queue */
 604         return 0;
 605 }
 606
 607 static int
 608 ltq_etop_init(struct net_device *dev)
 609 {
 610         struct ltq_etop_priv *priv = netdev_priv(dev);
 611         struct sockaddr mac;
 612         int err;
 613         bool random_mac = false;
 614
 615         dev->watchdog_timeo = 10 * HZ;
 616         err = ltq_etop_hw_init(dev);
 617         if (err)
 618                 goto err_hw;
 619         ltq_etop_change_mtu(dev, 1500);
 620
 621         memcpy(&mac, &priv->pldata->mac, sizeof(struct sockaddr));
 622         if (!is_valid_ether_addr(mac.sa_data)) {
 623                 pr_warn("etop: invalid MAC, using random\n");
 624                 eth_random_addr(mac.sa_data);
 625                 random_mac = true;
 626         }
 627
 628         err = ltq_etop_set_mac_address(dev, &mac);
 629         if (err)
 630                 goto err_netdev;
 631
 632         /* Set addr_assign_type here, ltq_etop_set_mac_address would reset it. */
 633         if (random_mac)
 634                 dev->addr_assign_type = NET_ADDR_RANDOM;
 635
 636         ltq_etop_set_multicast_list(dev);
 637         err = ltq_etop_mdio_init(dev);
 638         if (err)
 639                 goto err_netdev;
 640         return 0;
 641
 642 err_netdev:
 643         unregister_netdev(dev);
 644         free_netdev(dev);
 645 err_hw:
 646         ltq_etop_hw_exit(dev);
 647         return err;
 648 }
 649
 650 static void
 651 ltq_etop_tx_timeout(struct net_device *dev)
 652 {
 653         int err;
 654
 655         ltq_etop_hw_exit(dev);
 656         err = ltq_etop_hw_init(dev);
 657         if (err)
 658                 goto err_hw;
 659         netif_trans_update(dev);
 660         netif_wake_queue(dev);
 661         return;
 662
 663 err_hw:
 664         ltq_etop_hw_exit(dev);
 665         netdev_err(dev, "failed to restart etop after TX timeout\n");
 666 }
 667
 668 static const struct net_device_ops ltq_eth_netdev_ops = {
 669         .ndo_open = ltq_etop_open,
 670         .ndo_stop = ltq_etop_stop,
 671         .ndo_start_xmit = ltq_etop_tx,
 672         .ndo_change_mtu = ltq_etop_change_mtu,
 673         .ndo_do_ioctl = ltq_etop_ioctl,
 674         .ndo_set_mac_address = ltq_etop_set_mac_address,
 675         .ndo_validate_addr = eth_validate_addr,
 676         .ndo_set_rx_mode = ltq_etop_set_multicast_list,
 677         .ndo_select_queue = ltq_etop_select_queue,
 678         .ndo_init = ltq_etop_init,
 679         .ndo_tx_timeout = ltq_etop_tx_timeout,
 680 };
 681
 682 static int __init
 683 ltq_etop_probe(struct platform_device *pdev)
 684 {
 685         struct net_device *dev;
 686         struct ltq_etop_priv *priv;
 687         struct resource *res;
 688         int err;
 689         int i;
 690
 691         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 692         if (!res) {
 693                 dev_err(&pdev->dev, "failed to get etop resource\n");
 694                 err = -ENOENT;
 695                 goto err_out;
 696         }
 697
 698         res = devm_request_mem_region(&pdev->dev, res->start,
 699                 resource_size(res), dev_name(&pdev->dev));
 700         if (!res) {
 701                 dev_err(&pdev->dev, "failed to request etop resource\n");
 702                 err = -EBUSY;
 703                 goto err_out;
 704         }
 705
 706         ltq_etop_membase = devm_ioremap_nocache(&pdev->dev,
 707                 res->start, resource_size(res));
 708         if (!ltq_etop_membase) {
 709                 dev_err(&pdev->dev, "failed to remap etop engine %d\n",
 710                         pdev->id);
 711                 err = -ENOMEM;
 712                 goto err_out;
 713         }
 714
 715         dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4);
 716         if (!dev) {
 717                 err = -ENOMEM;
 718                 goto err_out;
 719         }
 720         strcpy(dev->name, "eth%d");
 721         dev->netdev_ops = &ltq_eth_netdev_ops;
 722         dev->ethtool_ops = &ltq_etop_ethtool_ops;
 723         priv = netdev_priv(dev);
 724         priv->res = res;
 725         priv->pdev = pdev;
 726         priv->pldata = dev_get_platdata(&pdev->dev);
 727         priv->netdev = dev;
 728         spin_lock_init(&priv->lock);
 729
 730         for (i = 0; i < MAX_DMA_CHAN; i++) {
 731                 if (IS_TX(i))
 732                         netif_napi_add(dev, &priv->ch[i].napi,
 733                                 ltq_etop_poll_tx, 8);
 734                 else if (IS_RX(i))
 735                         netif_napi_add(dev, &priv->ch[i].napi,
 736                                 ltq_etop_poll_rx, 32);
 737                 priv->ch[i].netdev = dev;
 738         }
 739
 740         err = register_netdev(dev);
 741         if (err)
 742                 goto err_free;
 743
 744         platform_set_drvdata(pdev, dev);
 745         return 0;
 746
 747 err_free:
 748         free_netdev(dev);
 749 err_out:
 750         return err;
 751 }
 752
 753 static int
 754 ltq_etop_remove(struct platform_device *pdev)
 755 {
 756         struct net_device *dev = platform_get_drvdata(pdev);
 757
 758         if (dev) {
 759                 netif_tx_stop_all_queues(dev);
 760                 ltq_etop_hw_exit(dev);
 761                 ltq_etop_mdio_cleanup(dev);
 762                 unregister_netdev(dev);
 763         }
 764         return 0;
 765 }
 766
 767 static struct platform_driver ltq_mii_driver = {
 768         .remove = ltq_etop_remove,
 769         .driver = {
 770                 .name = "ltq_etop",
 771         },
 772 };
 773
 774 int __init
 775 init_ltq_etop(void)
 776 {
 777         int ret = platform_driver_probe(&ltq_mii_driver, ltq_etop_probe);
 778
 779         if (ret)
 780                 pr_err("ltq_etop: Error registering platform driver!");
 781         return ret;
 782 }
 783
 784 static void __exit
 785 exit_ltq_etop(void)
 786 {
 787         platform_driver_unregister(&ltq_mii_driver);
 788 }
 789
 790 module_init(init_ltq_etop);
 791 module_exit(exit_ltq_etop);
 792
 793 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 794 MODULE_DESCRIPTION("Lantiq SoC ETOP");
 795 MODULE_LICENSE("GPL");