target/linux/ramips/files/drivers/net/ramips.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; version 2 of the License
   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) 2009 John Crispin <blogic@openwrt.org>
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/init.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/ethtool.h>
  26 #include <linux/platform_device.h>
  27
  28 #include <ramips_eth_platform.h>
  29 #include "ramips_eth.h"
  30
  31 #define TX_TIMEOUT (20 * HZ / 100)
  32 #define MAX_RX_LENGTH   1600
  33
  34 #ifdef CONFIG_RALINK_RT305X
  35 #include "ramips_esw.c"
  36 #else
  37 static inline int rt305x_esw_init(void) { return 0; }
  38 static inline void rt305x_esw_exit(void) { }
  39 #endif
  40
  41 #define phys_to_bus(a)  (a & 0x1FFFFFFF)
  42
  43 static struct net_device * ramips_dev;
  44 static void __iomem *ramips_fe_base = 0;
  45
  46 static inline void
  47 ramips_fe_wr(u32 val, unsigned reg)
  48 {
  49         __raw_writel(val, ramips_fe_base + reg);
  50 }
  51
  52 static inline u32
  53 ramips_fe_rr(unsigned reg)
  54 {
  55         return __raw_readl(ramips_fe_base + reg);
  56 }
  57
  58 static inline void
  59 ramips_fe_int_disable(u32 mask)
  60 {
  61         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~mask,
  62                      RAMIPS_FE_INT_ENABLE);
  63         /* flush write */
  64         ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
  65 }
  66
  67 static inline void
  68 ramips_fe_int_enable(u32 mask)
  69 {
  70         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | mask,
  71                      RAMIPS_FE_INT_ENABLE);
  72         /* flush write */
  73         ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
  74 }
  75
  76 static inline void
  77 ramips_hw_set_macaddr(unsigned char *mac)
  78 {
  79         ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
  80         ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
  81                      RAMIPS_GDMA1_MAC_ADRL);
  82 }
  83
  84 #ifdef CONFIG_RALINK_RT288X
  85 static void
  86 ramips_setup_mdio_cfg(struct raeth_priv *re)
  87 {
  88         unsigned int mdio_cfg;
  89
  90         mdio_cfg = RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
  91                    RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
  92                    RAMIPS_MDIO_CFG_GP1_FRC_EN;
  93
  94         if (re->duplex == DUPLEX_FULL)
  95                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_DUPLEX;
  96
  97         if (re->tx_fc)
  98                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_TX;
  99
 100         if (re->rx_fc)
 101                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_RX;
 102
 103         switch (re->speed) {
 104         case SPEED_10:
 105                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_10;
 106                 break;
 107         case SPEED_100:
 108                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_100;
 109                 break;
 110         case SPEED_1000:
 111                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_1000;
 112                 break;
 113         default:
 114                 BUG();
 115         }
 116
 117         ramips_fe_wr(mdio_cfg, RAMIPS_MDIO_CFG);
 118 }
 119 #else
 120 static inline void ramips_setup_mdio_cfg(struct raeth_priv *re)
 121 {
 122 }
 123 #endif /* CONFIG_RALINK_RT288X */
 124
 125 static void
 126 ramips_cleanup_dma(struct raeth_priv *re)
 127 {
 128         int i;
 129
 130         for (i = 0; i < NUM_RX_DESC; i++)
 131                 if (re->rx_skb[i])
 132                         dev_kfree_skb_any(re->rx_skb[i]);
 133
 134         if (re->rx)
 135                 dma_free_coherent(NULL,
 136                                   NUM_RX_DESC * sizeof(struct ramips_rx_dma),
 137                                   re->rx, re->rx_desc_dma);
 138
 139         if (re->tx)
 140                 dma_free_coherent(NULL,
 141                                   NUM_TX_DESC * sizeof(struct ramips_tx_dma),
 142                                   re->tx, re->tx_desc_dma);
 143 }
 144
 145 static int
 146 ramips_alloc_dma(struct raeth_priv *re)
 147 {
 148         int err = -ENOMEM;
 149         int i;
 150
 151         re->skb_free_idx = 0;
 152
 153         /* setup tx ring */
 154         re->tx = dma_alloc_coherent(NULL,
 155                                     NUM_TX_DESC * sizeof(struct ramips_tx_dma),
 156                                     &re->tx_desc_dma, GFP_ATOMIC);
 157         if (!re->tx)
 158                 goto err_cleanup;
 159
 160         memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
 161         for (i = 0; i < NUM_TX_DESC; i++) {
 162                 re->tx[i].txd2 = TX_DMA_LSO | TX_DMA_DONE;
 163                 re->tx[i].txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
 164         }
 165
 166         /* setup rx ring */
 167         re->rx = dma_alloc_coherent(NULL,
 168                                     NUM_RX_DESC * sizeof(struct ramips_rx_dma),
 169                                     &re->rx_desc_dma, GFP_ATOMIC);
 170         if (!re->rx)
 171                 goto err_cleanup;
 172
 173         memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
 174         for (i = 0; i < NUM_RX_DESC; i++) {
 175                 dma_addr_t dma_addr;
 176                 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH +
 177                                                         NET_IP_ALIGN);
 178
 179                 if (!new_skb)
 180                         goto err_cleanup;
 181
 182                 skb_reserve(new_skb, NET_IP_ALIGN);
 183
 184                 dma_addr = dma_map_single(NULL, new_skb->data,
 185                                           MAX_RX_LENGTH, DMA_FROM_DEVICE);
 186                 re->rx_dma[i] = dma_addr;
 187                 re->rx[i].rxd1 = (unsigned int) re->rx_dma[i];
 188                 re->rx[i].rxd2 |= RX_DMA_LSO;
 189                 re->rx_skb[i] = new_skb;
 190         }
 191
 192         return 0;
 193
 194  err_cleanup:
 195         ramips_cleanup_dma(re);
 196         return err;
 197 }
 198
 199 static void
 200 ramips_setup_dma(struct raeth_priv *re)
 201 {
 202         ramips_fe_wr(re->tx_desc_dma, RAMIPS_TX_BASE_PTR0);
 203         ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
 204         ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
 205         ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
 206
 207         ramips_fe_wr(re->rx_desc_dma, RAMIPS_RX_BASE_PTR0);
 208         ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
 209         ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
 210         ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
 211 }
 212
 213 static int
 214 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 215 {
 216         struct raeth_priv *priv = netdev_priv(dev);
 217         unsigned long tx;
 218         unsigned int tx_next;
 219         unsigned int mapped_addr;
 220
 221         if (priv->plat->min_pkt_len) {
 222                 if (skb->len < priv->plat->min_pkt_len) {
 223                         if (skb_padto(skb, priv->plat->min_pkt_len)) {
 224                                 printk(KERN_ERR
 225                                        "ramips_eth: skb_padto failed\n");
 226                                 kfree_skb(skb);
 227                                 return 0;
 228                         }
 229                         skb_put(skb, priv->plat->min_pkt_len - skb->len);
 230                 }
 231         }
 232
 233         dev->trans_start = jiffies;
 234         mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
 235                                                     DMA_TO_DEVICE);
 236         dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
 237         spin_lock(&priv->page_lock);
 238         tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
 239         tx_next = (tx + 1) % NUM_TX_DESC;
 240
 241         if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
 242             !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
 243             !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
 244                 goto out;
 245
 246         priv->tx[tx].txd1 = mapped_addr;
 247         priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
 248         priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
 249         dev->stats.tx_packets++;
 250         dev->stats.tx_bytes += skb->len;
 251         priv->tx_skb[tx] = skb;
 252         wmb();
 253         ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
 254         spin_unlock(&priv->page_lock);
 255         return NETDEV_TX_OK;
 256
 257  out:
 258         spin_unlock(&priv->page_lock);
 259         dev->stats.tx_dropped++;
 260         kfree_skb(skb);
 261         return NETDEV_TX_OK;
 262 }
 263
 264 static void
 265 ramips_eth_rx_hw(unsigned long ptr)
 266 {
 267         struct net_device *dev = (struct net_device *) ptr;
 268         struct raeth_priv *priv = netdev_priv(dev);
 269         int rx;
 270         int max_rx = 16;
 271
 272         while (max_rx) {
 273                 struct sk_buff *rx_skb, *new_skb;
 274                 int pktlen;
 275
 276                 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
 277                 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
 278                         break;
 279                 max_rx--;
 280
 281                 rx_skb = priv->rx_skb[rx];
 282                 pktlen = RX_DMA_PLEN0(priv->rx[rx].rxd2);
 283
 284                 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + NET_IP_ALIGN);
 285                 /* Reuse the buffer on allocation failures */
 286                 if (new_skb) {
 287                         dma_addr_t dma_addr;
 288
 289                         dma_unmap_single(NULL, priv->rx_dma[rx], MAX_RX_LENGTH,
 290                                          DMA_FROM_DEVICE);
 291
 292                         skb_put(rx_skb, pktlen);
 293                         rx_skb->dev = dev;
 294                         rx_skb->protocol = eth_type_trans(rx_skb, dev);
 295                         rx_skb->ip_summed = CHECKSUM_NONE;
 296                         dev->stats.rx_packets++;
 297                         dev->stats.rx_bytes += pktlen;
 298                         netif_rx(rx_skb);
 299
 300                         priv->rx_skb[rx] = new_skb;
 301                         skb_reserve(new_skb, NET_IP_ALIGN);
 302
 303                         dma_addr = dma_map_single(NULL,
 304                                                   new_skb->data,
 305                                                   MAX_RX_LENGTH,
 306                                                   DMA_FROM_DEVICE);
 307                         priv->rx_dma[rx] = dma_addr;
 308                         priv->rx[rx].rxd1 = (unsigned int) dma_addr;
 309                 } else {
 310                         dev->stats.rx_dropped++;
 311                 }
 312
 313                 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
 314                 wmb();
 315                 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
 316         }
 317
 318         if (max_rx == 0)
 319                 tasklet_schedule(&priv->rx_tasklet);
 320         else
 321                 ramips_fe_int_enable(RAMIPS_RX_DLY_INT);
 322 }
 323
 324 static void
 325 ramips_eth_tx_housekeeping(unsigned long ptr)
 326 {
 327         struct net_device *dev = (struct net_device*)ptr;
 328         struct raeth_priv *priv = netdev_priv(dev);
 329
 330         spin_lock(&priv->page_lock);
 331         while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
 332                (priv->tx_skb[priv->skb_free_idx])) {
 333                 dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
 334                 priv->tx_skb[priv->skb_free_idx] = 0;
 335                 priv->skb_free_idx++;
 336                 if (priv->skb_free_idx >= NUM_TX_DESC)
 337                         priv->skb_free_idx = 0;
 338         }
 339         spin_unlock(&priv->page_lock);
 340
 341         ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
 342 }
 343
 344 static void
 345 ramips_eth_timeout(struct net_device *dev)
 346 {
 347         struct raeth_priv *priv = netdev_priv(dev);
 348
 349         tasklet_schedule(&priv->tx_housekeeping_tasklet);
 350 }
 351
 352 static irqreturn_t
 353 ramips_eth_irq(int irq, void *dev)
 354 {
 355         struct raeth_priv *priv = netdev_priv(dev);
 356         unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
 357
 358         ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
 359
 360         if (fe_int & RAMIPS_RX_DLY_INT) {
 361                 ramips_fe_int_disable(RAMIPS_RX_DLY_INT);
 362                 tasklet_schedule(&priv->rx_tasklet);
 363         }
 364
 365         if (fe_int & RAMIPS_TX_DLY_INT) {
 366                 ramips_fe_int_disable(RAMIPS_TX_DLY_INT);
 367                 tasklet_schedule(&priv->tx_housekeeping_tasklet);
 368         }
 369
 370         return IRQ_HANDLED;
 371 }
 372
 373 static int
 374 ramips_eth_open(struct net_device *dev)
 375 {
 376         struct raeth_priv *priv = netdev_priv(dev);
 377         int err;
 378
 379         err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
 380                           dev->name, dev);
 381         if (err)
 382                 return err;
 383
 384         err = ramips_alloc_dma(priv);
 385         if (err)
 386                 goto err_free_irq;
 387
 388         ramips_hw_set_macaddr(dev->dev_addr);
 389
 390         ramips_setup_dma(priv);
 391         ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
 392                 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
 393                 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
 394                 RAMIPS_PDMA_GLO_CFG);
 395         ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
 396                 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
 397                 ((priv->plat->sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
 398                 RAMIPS_FE_GLO_CFG);
 399
 400         tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
 401                      (unsigned long)dev);
 402         tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
 403
 404         ramips_setup_mdio_cfg(priv);
 405
 406         ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
 407         ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
 408         ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
 409                 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
 410                 RAMIPS_GDMA1_FWD_CFG);
 411         ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
 412                 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
 413                 RAMIPS_CDMA_CSG_CFG);
 414         ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
 415         ramips_fe_wr(1, RAMIPS_FE_RST_GL);
 416         ramips_fe_wr(0, RAMIPS_FE_RST_GL);
 417
 418         netif_start_queue(dev);
 419         return 0;
 420
 421  err_free_irq:
 422         free_irq(dev->irq, dev);
 423         return err;
 424 }
 425
 426 static int
 427 ramips_eth_stop(struct net_device *dev)
 428 {
 429         struct raeth_priv *priv = netdev_priv(dev);
 430
 431         ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
 432                      ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
 433                      RAMIPS_PDMA_GLO_CFG);
 434
 435         /* disable all interrupts in the hw */
 436         ramips_fe_wr(0, RAMIPS_FE_INT_ENABLE);
 437
 438         free_irq(dev->irq, dev);
 439         netif_stop_queue(dev);
 440         tasklet_kill(&priv->tx_housekeeping_tasklet);
 441         tasklet_kill(&priv->rx_tasklet);
 442         ramips_cleanup_dma(priv);
 443         printk(KERN_DEBUG "ramips_eth: stopped\n");
 444         return 0;
 445 }
 446
 447 static int __init
 448 ramips_eth_probe(struct net_device *dev)
 449 {
 450         struct raeth_priv *priv = netdev_priv(dev);
 451
 452         BUG_ON(!priv->plat->reset_fe);
 453         priv->plat->reset_fe();
 454         net_srandom(jiffies);
 455         memcpy(dev->dev_addr, priv->plat->mac, ETH_ALEN);
 456
 457         ether_setup(dev);
 458         dev->mtu = 1500;
 459         dev->watchdog_timeo = TX_TIMEOUT;
 460         spin_lock_init(&priv->page_lock);
 461
 462         return 0;
 463 }
 464
 465 static const struct net_device_ops ramips_eth_netdev_ops = {
 466         .ndo_init               = ramips_eth_probe,
 467         .ndo_open               = ramips_eth_open,
 468         .ndo_stop               = ramips_eth_stop,
 469         .ndo_start_xmit         = ramips_eth_hard_start_xmit,
 470         .ndo_tx_timeout         = ramips_eth_timeout,
 471         .ndo_change_mtu         = eth_change_mtu,
 472         .ndo_set_mac_address    = eth_mac_addr,
 473         .ndo_validate_addr      = eth_validate_addr,
 474 };
 475
 476 static int
 477 ramips_eth_plat_probe(struct platform_device *plat)
 478 {
 479         struct raeth_priv *priv;
 480         struct ramips_eth_platform_data *data = plat->dev.platform_data;
 481         struct resource *res;
 482         int err;
 483
 484         if (!data) {
 485                 dev_err(&plat->dev, "no platform data specified\n");
 486                 return -EINVAL;
 487         }
 488
 489         res = platform_get_resource(plat, IORESOURCE_MEM, 0);
 490         if (!res) {
 491                 dev_err(&plat->dev, "no memory resource found\n");
 492                 return -ENXIO;
 493         }
 494
 495         ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
 496         if (!ramips_fe_base)
 497                 return -ENOMEM;
 498
 499         ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
 500         if (!ramips_dev) {
 501                 dev_err(&plat->dev, "alloc_etherdev failed\n");
 502                 err = -ENOMEM;
 503                 goto err_unmap;
 504         }
 505
 506         strcpy(ramips_dev->name, "eth%d");
 507         ramips_dev->irq = platform_get_irq(plat, 0);
 508         if (ramips_dev->irq < 0) {
 509                 dev_err(&plat->dev, "no IRQ resource found\n");
 510                 err = -ENXIO;
 511                 goto err_free_dev;
 512         }
 513         ramips_dev->addr_len = ETH_ALEN;
 514         ramips_dev->base_addr = (unsigned long)ramips_fe_base;
 515         ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
 516
 517         priv = netdev_priv(ramips_dev);
 518
 519         priv->speed = data->speed;
 520         priv->duplex = data->duplex;
 521         priv->rx_fc = data->rx_fc;
 522         priv->tx_fc = data->tx_fc;
 523         priv->plat = data;
 524
 525         err = register_netdev(ramips_dev);
 526         if (err) {
 527                 dev_err(&plat->dev, "error bringing up device\n");
 528                 goto err_free_dev;
 529         }
 530
 531         printk(KERN_DEBUG "ramips_eth: loaded\n");
 532         return 0;
 533
 534  err_free_dev:
 535         kfree(ramips_dev);
 536  err_unmap:
 537         iounmap(ramips_fe_base);
 538         return err;
 539 }
 540
 541 static int
 542 ramips_eth_plat_remove(struct platform_device *plat)
 543 {
 544         unregister_netdev(ramips_dev);
 545         free_netdev(ramips_dev);
 546         printk(KERN_DEBUG "ramips_eth: unloaded\n");
 547         return 0;
 548 }
 549
 550 static struct platform_driver ramips_eth_driver = {
 551         .probe = ramips_eth_plat_probe,
 552         .remove = ramips_eth_plat_remove,
 553         .driver = {
 554                 .name = "ramips_eth",
 555                 .owner = THIS_MODULE,
 556         },
 557 };
 558
 559 static int __init
 560 ramips_eth_init(void)
 561 {
 562         int ret;
 563
 564         ret = rt305x_esw_init();
 565         if (ret)
 566                 return ret;
 567
 568         ret = platform_driver_register(&ramips_eth_driver);
 569         if (ret) {
 570                 printk(KERN_ERR
 571                        "ramips_eth: Error registering platfom driver!\n");
 572                 goto esw_cleanup;
 573         }
 574
 575         return 0;
 576
 577 esw_cleanup:
 578         rt305x_esw_exit();
 579         return ret;
 580 }
 581
 582 static void __exit
 583 ramips_eth_cleanup(void)
 584 {
 585         platform_driver_unregister(&ramips_eth_driver);
 586         rt305x_esw_exit();
 587 }
 588
 589 module_init(ramips_eth_init);
 590 module_exit(ramips_eth_cleanup);
 591
 592 MODULE_LICENSE("GPL");
 593 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 594 MODULE_DESCRIPTION("ethernet driver for ramips boards");