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, write to the Free Software
  13  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  14  *
  15  *   Copyright (C) 2011 John Crispin <blogic@openwrt.org>
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/slab.h>
  20 #include <linux/errno.h>
  21 #include <linux/types.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/in.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/phy.h>
  28 #include <linux/ip.h>
  29 #include <linux/tcp.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/mm.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/ethtool.h>
  34 #include <linux/init.h>
  35 #include <linux/delay.h>
  36 #include <linux/io.h>
  37 #include <linux/dma-mapping.h>
  38 #include <linux/module.h>
  39
  40 #include <asm/checksum.h>
  41
  42 #include <lantiq_soc.h>
  43 #include <xway_dma.h>
  44 #include <lantiq_platform.h>
  45
  46 #define LTQ_ETOP_MDIO           0x11804
  47 #define MDIO_REQUEST            0x80000000
  48 #define MDIO_READ               0x40000000
  49 #define MDIO_ADDR_MASK          0x1f
  50 #define MDIO_ADDR_OFFSET        0x15
  51 #define MDIO_REG_MASK           0x1f
  52 #define MDIO_REG_OFFSET         0x10
  53 #define MDIO_VAL_MASK           0xffff
  54
  55 #define PPE32_CGEN              0x800
  56 #define LQ_PPE32_ENET_MAC_CFG   0x1840
  57
  58 #define LTQ_ETOP_ENETS0         0x11850
  59 #define LTQ_ETOP_MAC_DA0        0x1186C
  60 #define LTQ_ETOP_MAC_DA1        0x11870
  61 #define LTQ_ETOP_CFG            0x16020
  62 #define LTQ_ETOP_IGPLEN         0x16080
  63
  64 #define MAX_DMA_CHAN            0x8
  65 #define MAX_DMA_CRC_LEN         0x4
  66 #define MAX_DMA_DATA_LEN        0x600
  67
  68 #define ETOP_FTCU               BIT(28)
  69 #define ETOP_MII_MASK           0xf
  70 #define ETOP_MII_NORMAL         0xd
  71 #define ETOP_MII_REVERSE        0xe
  72 #define ETOP_PLEN_UNDER         0x40
  73 #define ETOP_CGEN               0x800
  74
  75 /* use 2 static channels for TX/RX */
  76 #define LTQ_ETOP_TX_CHANNEL     1
  77 #define LTQ_ETOP_RX_CHANNEL     6
  78 #define IS_TX(x)                (x == LTQ_ETOP_TX_CHANNEL)
  79 #define IS_RX(x)                (x == LTQ_ETOP_RX_CHANNEL)
  80
  81 #define ltq_etop_r32(x)         ltq_r32(ltq_etop_membase + (x))
  82 #define ltq_etop_w32(x, y)      ltq_w32(x, ltq_etop_membase + (y))
  83 #define ltq_etop_w32_mask(x, y, z)      \
  84                 ltq_w32_mask(x, y, ltq_etop_membase + (z))
  85
  86 #define DRV_VERSION     "1.0"
  87
  88 static void __iomem *ltq_etop_membase;
  89
  90 struct ltq_etop_chan {
  91         int idx;
  92         int tx_free;
  93         struct net_device *netdev;
  94         struct napi_struct napi;
  95         struct ltq_dma_channel dma;
  96         struct sk_buff *skb[LTQ_DESC_NUM];
  97 };
  98
  99 struct ltq_etop_priv {
 100         struct net_device *netdev;
 101         struct platform_device *pdev;
 102         struct ltq_eth_data *pldata;
 103         struct resource *res;
 104
 105         struct mii_bus *mii_bus;
 106         struct phy_device *phydev;
 107
 108         struct ltq_etop_chan ch[MAX_DMA_CHAN];
 109         int tx_free[MAX_DMA_CHAN >> 1];
 110
 111         spinlock_t lock;
 112 };
 113
 114 static int
 115 ltq_etop_alloc_skb(struct ltq_etop_chan *ch)
 116 {
 117         ch->skb[ch->dma.desc] = netdev_alloc_skb(ch->netdev, MAX_DMA_DATA_LEN);
 118         if (!ch->skb[ch->dma.desc])
 119                 return -ENOMEM;
 120         ch->dma.desc_base[ch->dma.desc].addr = dma_map_single(NULL,
 121                 ch->skb[ch->dma.desc]->data, MAX_DMA_DATA_LEN,
 122                 DMA_FROM_DEVICE);
 123         ch->dma.desc_base[ch->dma.desc].addr =
 124                 CPHYSADDR(ch->skb[ch->dma.desc]->data);
 125         ch->dma.desc_base[ch->dma.desc].ctl =
 126                 LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) |
 127                 MAX_DMA_DATA_LEN;
 128         skb_reserve(ch->skb[ch->dma.desc], NET_IP_ALIGN);
 129         return 0;
 130 }
 131
 132 static void
 133 ltq_etop_hw_receive(struct ltq_etop_chan *ch)
 134 {
 135         struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
 136         struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
 137         struct sk_buff *skb = ch->skb[ch->dma.desc];
 138         int len = (desc->ctl & LTQ_DMA_SIZE_MASK) - MAX_DMA_CRC_LEN;
 139         unsigned long flags;
 140
 141         spin_lock_irqsave(&priv->lock, flags);
 142         if (ltq_etop_alloc_skb(ch)) {
 143                 netdev_err(ch->netdev,
 144                         "failed to allocate new rx buffer, stopping DMA\n");
 145                 ltq_dma_close(&ch->dma);
 146         }
 147         ch->dma.desc++;
 148         ch->dma.desc %= LTQ_DESC_NUM;
 149         spin_unlock_irqrestore(&priv->lock, flags);
 150
 151         skb_put(skb, len);
 152         skb->protocol = eth_type_trans(skb, ch->netdev);
 153         netif_receive_skb(skb);
 154 }
 155
 156 static int
 157 ltq_etop_poll_rx(struct napi_struct *napi, int budget)
 158 {
 159         struct ltq_etop_chan *ch = container_of(napi,
 160                                 struct ltq_etop_chan, napi);
 161         int rx = 0;
 162         int complete = 0;
 163
 164         while ((rx < budget) && !complete) {
 165                 struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
 166
 167                 if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
 168                         ltq_etop_hw_receive(ch);
 169                         rx++;
 170                 } else {
 171                         complete = 1;
 172                 }
 173         }
 174         if (complete || !rx) {
 175                 napi_complete(&ch->napi);
 176                 ltq_dma_ack_irq(&ch->dma);
 177         }
 178         return rx;
 179 }
 180
 181 static int
 182 ltq_etop_poll_tx(struct napi_struct *napi, int budget)
 183 {
 184         struct ltq_etop_chan *ch =
 185                 container_of(napi, struct ltq_etop_chan, napi);
 186         struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
 187         struct netdev_queue *txq =
 188                 netdev_get_tx_queue(ch->netdev, ch->idx >> 1);
 189         unsigned long flags;
 190
 191         spin_lock_irqsave(&priv->lock, flags);
 192         while ((ch->dma.desc_base[ch->tx_free].ctl &
 193                         (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
 194                 dev_kfree_skb_any(ch->skb[ch->tx_free]);
 195                 ch->skb[ch->tx_free] = NULL;
 196                 memset(&ch->dma.desc_base[ch->tx_free], 0,
 197                         sizeof(struct ltq_dma_desc));
 198                 ch->tx_free++;
 199                 ch->tx_free %= LTQ_DESC_NUM;
 200         }
 201         spin_unlock_irqrestore(&priv->lock, flags);
 202
 203         if (netif_tx_queue_stopped(txq))
 204                 netif_tx_start_queue(txq);
 205         napi_complete(&ch->napi);
 206         ltq_dma_ack_irq(&ch->dma);
 207         return 1;
 208 }
 209
 210 static irqreturn_t
 211 ltq_etop_dma_irq(int irq, void *_priv)
 212 {
 213         struct ltq_etop_priv *priv = _priv;
 214         int ch = irq - LTQ_DMA_CH0_INT;
 215
 216         napi_schedule(&priv->ch[ch].napi);
 217         return IRQ_HANDLED;
 218 }
 219
 220 static void
 221 ltq_etop_free_channel(struct net_device *dev, struct ltq_etop_chan *ch)
 222 {
 223         struct ltq_etop_priv *priv = netdev_priv(dev);
 224
 225         ltq_dma_free(&ch->dma);
 226         if (ch->dma.irq)
 227                 free_irq(ch->dma.irq, priv);
 228         if (IS_RX(ch->idx)) {
 229                 int desc;
 230                 for (desc = 0; desc < LTQ_DESC_NUM; desc++)
 231                         dev_kfree_skb_any(ch->skb[ch->dma.desc]);
 232         }
 233 }
 234
 235 static void
 236 ltq_etop_hw_exit(struct net_device *dev)
 237 {
 238         struct ltq_etop_priv *priv = netdev_priv(dev);
 239         int i;
 240
 241         ltq_pmu_disable(PMU_PPE);
 242         for (i = 0; i < MAX_DMA_CHAN; i++)
 243                 if (IS_TX(i) || IS_RX(i))
 244                         ltq_etop_free_channel(dev, &priv->ch[i]);
 245 }
 246
 247 static int
 248 ltq_etop_hw_init(struct net_device *dev)
 249 {
 250         struct ltq_etop_priv *priv = netdev_priv(dev);
 251         int i;
 252
 253         ltq_pmu_enable(PMU_PPE);
 254
 255         switch (priv->pldata->mii_mode) {
 256         case PHY_INTERFACE_MODE_RMII:
 257                 ltq_etop_w32_mask(ETOP_MII_MASK,
 258                         ETOP_MII_REVERSE, LTQ_ETOP_CFG);
 259                 break;
 260
 261         case PHY_INTERFACE_MODE_MII:
 262                 ltq_etop_w32_mask(ETOP_MII_MASK,
 263                         ETOP_MII_NORMAL, LTQ_ETOP_CFG);
 264                 break;
 265
 266         default:
 267                 netdev_err(dev, "unknown mii mode %d\n",
 268                         priv->pldata->mii_mode);
 269                 return -ENOTSUPP;
 270         }
 271
 272         /* enable crc generation */
 273         ltq_etop_w32(PPE32_CGEN, LQ_PPE32_ENET_MAC_CFG);
 274
 275         ltq_dma_init_port(DMA_PORT_ETOP);
 276
 277         for (i = 0; i < MAX_DMA_CHAN; i++) {
 278                 int irq = LTQ_DMA_CH0_INT + i;
 279                 struct ltq_etop_chan *ch = &priv->ch[i];
 280
 281                 ch->idx = ch->dma.nr = i;
 282
 283                 if (IS_TX(i)) {
 284                         ltq_dma_alloc_tx(&ch->dma);
 285                         request_irq(irq, ltq_etop_dma_irq, IRQF_DISABLED,
 286                                 "etop_tx", priv);
 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                         request_irq(irq, ltq_etop_dma_irq, IRQF_DISABLED,
 295                                 "etop_rx", priv);
 296                 }
 297                 ch->dma.irq = irq;
 298         }
 299         return 0;
 300 }
 301
 302 static void
 303 ltq_etop_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 304 {
 305         strlcpy(info->driver, "Lantiq ETOP", sizeof(info->driver));
 306         strlcpy(info->bus_info, "internal", sizeof(info->bus_info));
 307         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
 308 }
 309
 310 static int
 311 ltq_etop_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 312 {
 313         struct ltq_etop_priv *priv = netdev_priv(dev);
 314
 315         return phy_ethtool_gset(priv->phydev, cmd);
 316 }
 317
 318 static int
 319 ltq_etop_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 320 {
 321         struct ltq_etop_priv *priv = netdev_priv(dev);
 322
 323         return phy_ethtool_sset(priv->phydev, cmd);
 324 }
 325
 326 static int
 327 ltq_etop_nway_reset(struct net_device *dev)
 328 {
 329         struct ltq_etop_priv *priv = netdev_priv(dev);
 330
 331         return phy_start_aneg(priv->phydev);
 332 }
 333
 334 static const struct ethtool_ops ltq_etop_ethtool_ops = {
 335         .get_drvinfo = ltq_etop_get_drvinfo,
 336         .get_settings = ltq_etop_get_settings,
 337         .set_settings = ltq_etop_set_settings,
 338         .nway_reset = ltq_etop_nway_reset,
 339 };
 340
 341 static int
 342 ltq_etop_mdio_wr(struct mii_bus *bus, int phy_addr, int phy_reg, u16 phy_data)
 343 {
 344         u32 val = MDIO_REQUEST |
 345                 ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
 346                 ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET) |
 347                 phy_data;
 348
 349         while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
 350                 ;
 351         ltq_etop_w32(val, LTQ_ETOP_MDIO);
 352         return 0;
 353 }
 354
 355 static int
 356 ltq_etop_mdio_rd(struct mii_bus *bus, int phy_addr, int phy_reg)
 357 {
 358         u32 val = MDIO_REQUEST | MDIO_READ |
 359                 ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
 360                 ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET);
 361
 362         while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
 363                 ;
 364         ltq_etop_w32(val, LTQ_ETOP_MDIO);
 365         while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
 366                 ;
 367         val = ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_VAL_MASK;
 368         return val;
 369 }
 370
 371 static void
 372 ltq_etop_mdio_link(struct net_device *dev)
 373 {
 374         /* nothing to do  */
 375 }
 376
 377 static int
 378 ltq_etop_mdio_probe(struct net_device *dev)
 379 {
 380         struct ltq_etop_priv *priv = netdev_priv(dev);
 381         struct phy_device *phydev = NULL;
 382         int phy_addr;
 383
 384         for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
 385                 if (priv->mii_bus->phy_map[phy_addr]) {
 386                         phydev = priv->mii_bus->phy_map[phy_addr];
 387                         break;
 388                 }
 389         }
 390
 391         if (!phydev) {
 392                 netdev_err(dev, "no PHY found\n");
 393                 return -ENODEV;
 394         }
 395
 396         phydev = phy_connect(dev, dev_name(&phydev->dev),
 397                              &ltq_etop_mdio_link, priv->pldata->mii_mode);
 398
 399         if (IS_ERR(phydev)) {
 400                 netdev_err(dev, "Could not attach to PHY\n");
 401                 return PTR_ERR(phydev);
 402         }
 403
 404         phydev->supported &= (SUPPORTED_10baseT_Half
 405                               | SUPPORTED_10baseT_Full
 406                               | SUPPORTED_100baseT_Half
 407                               | SUPPORTED_100baseT_Full
 408                               | SUPPORTED_Autoneg
 409                               | SUPPORTED_MII
 410                               | SUPPORTED_TP);
 411
 412         phydev->advertising = phydev->supported;
 413         priv->phydev = phydev;
 414         pr_info("%s: attached PHY [%s] (phy_addr=%s, irq=%d)\n",
 415                dev->name, phydev->drv->name,
 416                dev_name(&phydev->dev), phydev->irq);
 417
 418         return 0;
 419 }
 420
 421 static int
 422 ltq_etop_mdio_init(struct net_device *dev)
 423 {
 424         struct ltq_etop_priv *priv = netdev_priv(dev);
 425         int i;
 426         int err;
 427
 428         priv->mii_bus = mdiobus_alloc();
 429         if (!priv->mii_bus) {
 430                 netdev_err(dev, "failed to allocate mii bus\n");
 431                 err = -ENOMEM;
 432                 goto err_out;
 433         }
 434
 435         priv->mii_bus->priv = dev;
 436         priv->mii_bus->read = ltq_etop_mdio_rd;
 437         priv->mii_bus->write = ltq_etop_mdio_wr;
 438         priv->mii_bus->name = "ltq_mii";
 439         snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
 440                 priv->pdev->name, priv->pdev->id);
 441         priv->mii_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
 442         if (!priv->mii_bus->irq) {
 443                 err = -ENOMEM;
 444                 goto err_out_free_mdiobus;
 445         }
 446
 447         for (i = 0; i < PHY_MAX_ADDR; ++i)
 448                 priv->mii_bus->irq[i] = PHY_POLL;
 449
 450         if (mdiobus_register(priv->mii_bus)) {
 451                 err = -ENXIO;
 452                 goto err_out_free_mdio_irq;
 453         }
 454
 455         if (ltq_etop_mdio_probe(dev)) {
 456                 err = -ENXIO;
 457                 goto err_out_unregister_bus;
 458         }
 459         return 0;
 460
 461 err_out_unregister_bus:
 462         mdiobus_unregister(priv->mii_bus);
 463 err_out_free_mdio_irq:
 464         kfree(priv->mii_bus->irq);
 465 err_out_free_mdiobus:
 466         mdiobus_free(priv->mii_bus);
 467 err_out:
 468         return err;
 469 }
 470
 471 static void
 472 ltq_etop_mdio_cleanup(struct net_device *dev)
 473 {
 474         struct ltq_etop_priv *priv = netdev_priv(dev);
 475
 476         phy_disconnect(priv->phydev);
 477         mdiobus_unregister(priv->mii_bus);
 478         kfree(priv->mii_bus->irq);
 479         mdiobus_free(priv->mii_bus);
 480 }
 481
 482 static int
 483 ltq_etop_open(struct net_device *dev)
 484 {
 485         struct ltq_etop_priv *priv = netdev_priv(dev);
 486         int i;
 487
 488         for (i = 0; i < MAX_DMA_CHAN; i++) {
 489                 struct ltq_etop_chan *ch = &priv->ch[i];
 490
 491                 if (!IS_TX(i) && (!IS_RX(i)))
 492                         continue;
 493                 ltq_dma_open(&ch->dma);
 494                 napi_enable(&ch->napi);
 495         }
 496         phy_start(priv->phydev);
 497         netif_tx_start_all_queues(dev);
 498         return 0;
 499 }
 500
 501 static int
 502 ltq_etop_stop(struct net_device *dev)
 503 {
 504         struct ltq_etop_priv *priv = netdev_priv(dev);
 505         int i;
 506
 507         netif_tx_stop_all_queues(dev);
 508         phy_stop(priv->phydev);
 509         for (i = 0; i < MAX_DMA_CHAN; i++) {
 510                 struct ltq_etop_chan *ch = &priv->ch[i];
 511
 512                 if (!IS_RX(i) && !IS_TX(i))
 513                         continue;
 514                 napi_disable(&ch->napi);
 515                 ltq_dma_close(&ch->dma);
 516         }
 517         return 0;
 518 }
 519
 520 static int
 521 ltq_etop_tx(struct sk_buff *skb, struct net_device *dev)
 522 {
 523         int queue = skb_get_queue_mapping(skb);
 524         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue);
 525         struct ltq_etop_priv *priv = netdev_priv(dev);
 526         struct ltq_etop_chan *ch = &priv->ch[(queue << 1) | 1];
 527         struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
 528         int len;
 529         unsigned long flags;
 530         u32 byte_offset;
 531
 532         len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
 533
 534         if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
 535                 dev_kfree_skb_any(skb);
 536                 netdev_err(dev, "tx ring full\n");
 537                 netif_tx_stop_queue(txq);
 538                 return NETDEV_TX_BUSY;
 539         }
 540
 541         /* dma needs to start on a 16 byte aligned address */
 542         byte_offset = CPHYSADDR(skb->data) % 16;
 543         ch->skb[ch->dma.desc] = skb;
 544
 545         dev->trans_start = jiffies;
 546
 547         spin_lock_irqsave(&priv->lock, flags);
 548         desc->addr = ((unsigned int) dma_map_single(NULL, skb->data, len,
 549                                                 DMA_TO_DEVICE)) - byte_offset;
 550         wmb();
 551         desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP |
 552                 LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK);
 553         ch->dma.desc++;
 554         ch->dma.desc %= LTQ_DESC_NUM;
 555         spin_unlock_irqrestore(&priv->lock, flags);
 556
 557         if (ch->dma.desc_base[ch->dma.desc].ctl & LTQ_DMA_OWN)
 558                 netif_tx_stop_queue(txq);
 559
 560         return NETDEV_TX_OK;
 561 }
 562
 563 static int
 564 ltq_etop_change_mtu(struct net_device *dev, int new_mtu)
 565 {
 566         int ret = eth_change_mtu(dev, new_mtu);
 567
 568         if (!ret) {
 569                 struct ltq_etop_priv *priv = netdev_priv(dev);
 570                 unsigned long flags;
 571
 572                 spin_lock_irqsave(&priv->lock, flags);
 573                 ltq_etop_w32((ETOP_PLEN_UNDER << 16) | new_mtu,
 574                         LTQ_ETOP_IGPLEN);
 575                 spin_unlock_irqrestore(&priv->lock, flags);
 576         }
 577         return ret;
 578 }
 579
 580 static int
 581 ltq_etop_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 582 {
 583         struct ltq_etop_priv *priv = netdev_priv(dev);
 584
 585         /* TODO: mii-toll reports "No MII transceiver present!." ?!*/
 586         return phy_mii_ioctl(priv->phydev, rq, cmd);
 587 }
 588
 589 static int
 590 ltq_etop_set_mac_address(struct net_device *dev, void *p)
 591 {
 592         int ret = eth_mac_addr(dev, p);
 593
 594         if (!ret) {
 595                 struct ltq_etop_priv *priv = netdev_priv(dev);
 596                 unsigned long flags;
 597
 598                 /* store the mac for the unicast filter */
 599                 spin_lock_irqsave(&priv->lock, flags);
 600                 ltq_etop_w32(*((u32 *)dev->dev_addr), LTQ_ETOP_MAC_DA0);
 601                 ltq_etop_w32(*((u16 *)&dev->dev_addr[4]) << 16,
 602                         LTQ_ETOP_MAC_DA1);
 603                 spin_unlock_irqrestore(&priv->lock, flags);
 604         }
 605         return ret;
 606 }
 607
 608 static void
 609 ltq_etop_set_multicast_list(struct net_device *dev)
 610 {
 611         struct ltq_etop_priv *priv = netdev_priv(dev);
 612         unsigned long flags;
 613
 614         /* ensure that the unicast filter is not enabled in promiscious mode */
 615         spin_lock_irqsave(&priv->lock, flags);
 616         if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI))
 617                 ltq_etop_w32_mask(ETOP_FTCU, 0, LTQ_ETOP_ENETS0);
 618         else
 619                 ltq_etop_w32_mask(0, ETOP_FTCU, LTQ_ETOP_ENETS0);
 620         spin_unlock_irqrestore(&priv->lock, flags);
 621 }
 622
 623 static u16
 624 ltq_etop_select_queue(struct net_device *dev, struct sk_buff *skb)
 625 {
 626         /* we are currently only using the first queue */
 627         return 0;
 628 }
 629
 630 static int
 631 ltq_etop_init(struct net_device *dev)
 632 {
 633         struct ltq_etop_priv *priv = netdev_priv(dev);
 634         struct sockaddr mac;
 635         int err;
 636         bool random_mac = false;
 637
 638         ether_setup(dev);
 639         dev->watchdog_timeo = 10 * HZ;
 640         err = ltq_etop_hw_init(dev);
 641         if (err)
 642                 goto err_hw;
 643         ltq_etop_change_mtu(dev, 1500);
 644
 645         memcpy(&mac, &priv->pldata->mac, sizeof(struct sockaddr));
 646         if (!is_valid_ether_addr(mac.sa_data)) {
 647                 pr_warn("etop: invalid MAC, using random\n");
 648                 eth_random_addr(mac.sa_data);
 649                 random_mac = true;
 650         }
 651
 652         err = ltq_etop_set_mac_address(dev, &mac);
 653         if (err)
 654                 goto err_netdev;
 655
 656         /* Set addr_assign_type here, ltq_etop_set_mac_address would reset it. */
 657         if (random_mac)
 658                 dev->addr_assign_type = NET_ADDR_RANDOM;
 659
 660         ltq_etop_set_multicast_list(dev);
 661         err = ltq_etop_mdio_init(dev);
 662         if (err)
 663                 goto err_netdev;
 664         return 0;
 665
 666 err_netdev:
 667         unregister_netdev(dev);
 668         free_netdev(dev);
 669 err_hw:
 670         ltq_etop_hw_exit(dev);
 671         return err;
 672 }
 673
 674 static void
 675 ltq_etop_tx_timeout(struct net_device *dev)
 676 {
 677         int err;
 678
 679         ltq_etop_hw_exit(dev);
 680         err = ltq_etop_hw_init(dev);
 681         if (err)
 682                 goto err_hw;
 683         dev->trans_start = jiffies;
 684         netif_wake_queue(dev);
 685         return;
 686
 687 err_hw:
 688         ltq_etop_hw_exit(dev);
 689         netdev_err(dev, "failed to restart etop after TX timeout\n");
 690 }
 691
 692 static const struct net_device_ops ltq_eth_netdev_ops = {
 693         .ndo_open = ltq_etop_open,
 694         .ndo_stop = ltq_etop_stop,
 695         .ndo_start_xmit = ltq_etop_tx,
 696         .ndo_change_mtu = ltq_etop_change_mtu,
 697         .ndo_do_ioctl = ltq_etop_ioctl,
 698         .ndo_set_mac_address = ltq_etop_set_mac_address,
 699         .ndo_validate_addr = eth_validate_addr,
 700         .ndo_set_rx_mode = ltq_etop_set_multicast_list,
 701         .ndo_select_queue = ltq_etop_select_queue,
 702         .ndo_init = ltq_etop_init,
 703         .ndo_tx_timeout = ltq_etop_tx_timeout,
 704 };
 705
 706 static int __init
 707 ltq_etop_probe(struct platform_device *pdev)
 708 {
 709         struct net_device *dev;
 710         struct ltq_etop_priv *priv;
 711         struct resource *res;
 712         int err;
 713         int i;
 714
 715         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 716         if (!res) {
 717                 dev_err(&pdev->dev, "failed to get etop resource\n");
 718                 err = -ENOENT;
 719                 goto err_out;
 720         }
 721
 722         res = devm_request_mem_region(&pdev->dev, res->start,
 723                 resource_size(res), dev_name(&pdev->dev));
 724         if (!res) {
 725                 dev_err(&pdev->dev, "failed to request etop resource\n");
 726                 err = -EBUSY;
 727                 goto err_out;
 728         }
 729
 730         ltq_etop_membase = devm_ioremap_nocache(&pdev->dev,
 731                 res->start, resource_size(res));
 732         if (!ltq_etop_membase) {
 733                 dev_err(&pdev->dev, "failed to remap etop engine %d\n",
 734                         pdev->id);
 735                 err = -ENOMEM;
 736                 goto err_out;
 737         }
 738
 739         dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4);
 740         if (!dev) {
 741                 err = -ENOMEM;
 742                 goto err_out;
 743         }
 744         strcpy(dev->name, "eth%d");
 745         dev->netdev_ops = &ltq_eth_netdev_ops;
 746         dev->ethtool_ops = &ltq_etop_ethtool_ops;
 747         priv = netdev_priv(dev);
 748         priv->res = res;
 749         priv->pdev = pdev;
 750         priv->pldata = dev_get_platdata(&pdev->dev);
 751         priv->netdev = dev;
 752         spin_lock_init(&priv->lock);
 753
 754         for (i = 0; i < MAX_DMA_CHAN; i++) {
 755                 if (IS_TX(i))
 756                         netif_napi_add(dev, &priv->ch[i].napi,
 757                                 ltq_etop_poll_tx, 8);
 758                 else if (IS_RX(i))
 759                         netif_napi_add(dev, &priv->ch[i].napi,
 760                                 ltq_etop_poll_rx, 32);
 761                 priv->ch[i].netdev = dev;
 762         }
 763
 764         err = register_netdev(dev);
 765         if (err)
 766                 goto err_free;
 767
 768         platform_set_drvdata(pdev, dev);
 769         return 0;
 770
 771 err_free:
 772         free_netdev(dev);
 773 err_out:
 774         return err;
 775 }
 776
 777 static int
 778 ltq_etop_remove(struct platform_device *pdev)
 779 {
 780         struct net_device *dev = platform_get_drvdata(pdev);
 781
 782         if (dev) {
 783                 netif_tx_stop_all_queues(dev);
 784                 ltq_etop_hw_exit(dev);
 785                 ltq_etop_mdio_cleanup(dev);
 786                 unregister_netdev(dev);
 787         }
 788         return 0;
 789 }
 790
 791 static struct platform_driver ltq_mii_driver = {
 792         .remove = ltq_etop_remove,
 793         .driver = {
 794                 .name = "ltq_etop",
 795                 .owner = THIS_MODULE,
 796         },
 797 };
 798
 799 int __init
 800 init_ltq_etop(void)
 801 {
 802         int ret = platform_driver_probe(&ltq_mii_driver, ltq_etop_probe);
 803
 804         if (ret)
 805                 pr_err("ltq_etop: Error registering platform driver!");
 806         return ret;
 807 }
 808
 809 static void __exit
 810 exit_ltq_etop(void)
 811 {
 812         platform_driver_unregister(&ltq_mii_driver);
 813 }
 814
 815 module_init(init_ltq_etop);
 816 module_exit(exit_ltq_etop);
 817
 818 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 819 MODULE_DESCRIPTION("Lantiq SoC ETOP");
 820 MODULE_LICENSE("GPL");