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